9. A ball is thrown straight up with an initial speed of 30 m/s. How long will it take to reach the top of its trajectory, and high will the ball go?​

Answers

Answer 1

Answer:

1.) Time t = 3.1 seconds

2.) Height h = 46 metres

Explanation:

given that the initial velocity U = 30 m/s

At the top of the trajectory, the final velocity V = 0

Using first equation of motion

V = U - gt

g is negative 9.81m/^2 as the object is going against the gravity.

Substitute all the parameters into the formula

0 = 30 - 9.81t

9.81t = 30

Make t the subject of formula

t = 30/9.81

t = 3.058 seconds

t = 3.1 seconds approximately

Therefore, it will take 3.1 seconds to reach to reach the top of its trajectory.

2.) The height it will go can be calculated by using second equation of motion

h = ut - 1/2gt^2

Substitutes U, g and t into the formula

h = 30(3.1) - 1/2 × 9.8 × 3.1^2

h = 93 - 47.089

h = 45.911 m

It will go 46 metres approximately high.


Related Questions

Which one of the following is not equivalent to 2.50 miles?
(1.00 mi = 1.61 km = 5280 ft, 1.00 yd = 3.00 ft = 12.0 in.)
(A) 1.32 x 104 ft
(B) 1.58 x 105 in
(C) 4.02 x 103 km
(D) 4.40 x 103 yd
(E) 4.02 x 105 cm

Answers

Answer:

Choice C is not equivalent to 2.50 miles.

Explanation:

The given data is now converted into feet, inches, kilometers, yards and centimeters:

mi - ft

[tex]x = (2.50\,mi)\cdot \left(5280\,\frac{ft}{mi} \right)[/tex]

[tex]x = 13200\,ft[/tex]

[tex]x = 1.320\times 10^{4}\,ft[/tex] (Choice A)

mi - in

[tex]x = (2.50\,mi)\cdot \left(5280\,\frac{ft}{mi} \right)\cdot \left(12\,\frac{in}{ft} \right)[/tex]

[tex]x = 158400\,in[/tex]

[tex]x = 1.584\times 10^{5}[/tex] (Choice B)

mi - km

[tex]x = (2.50\,mi)\cdot \left(1.61\,\frac{km}{mi} \right)[/tex]

[tex]x = 4.025\,km[/tex] (Different from Choice C)

mi - yd

[tex]x = (2.50\,mi)\cdot \left(5280\,\frac{ft}{mi}\right) \cdot \left(\frac{1}{3}\,\frac{yd}{ft} \right)[/tex]

[tex]x = 4400\,yd[/tex]

[tex]x = 4.40\times 10^{3}\,yd[/tex] (Choice D)

mi - cm

[tex]x = (2.50\,mi)\cdot \left(1.61\,\frac{km}{mi} \right)\cdot \left(100000\,\frac{cm}{km}\right)[/tex]

[tex]x = 402500\,cm[/tex]

[tex]x = 4.025\times 10^{5}\,cm[/tex] (Choice E)

Choice C is not equivalent to 2.50 miles.

why does a bouncing ball have a greater change in momentum than a ball that is just caught

Answers

If the ball bounces, then there is an additional velocity change sending the ball back upwards opposite the original direction. Thus, for the same collision time, bouncing involves a greater velocity change, a greater momentum change, and therefore a greater impulse.

Answer:

because with the change in momentum the velocity goes to zero. (more info below)

Explanation:

Momentum is the velocity change multiplied by the mass. When you think about it, bouncing an object means it comes back from anything it bounced against, giving it a velocity that is negative. This means that the velocity change for bouncing is greater than for colliding, as the velocity goes to zero in an inelastic collision like the one described.

hope this helped!


What caused the mistake that led to the destruction of the Mar's rover?

Answers

Answer:

Metric Math Mistake Muffed Mars Meteorology Mission. 1999: A disaster investigation board reports that NASA's Mars Climate Orbiter burned up in the Martian atmosphere because engineers failed to convert units from English to metric

Explanation:

hope this helps =)

the skeletal system serves all the following functions except

Answers

Answer:

The major functions of the bones are body support, facilitation of movement, protection of internal organs, storage of minerals and fat, and hematopoiesis. Together, the muscular system and skeletal system are known as the musculoskeletal system.

your question seems incomplete. Kindly give the full question so that it helps :)

Answer:

D.

producing ligaments and tendons

Explanation:

What is a good analogy for potential energy in a circuit?

Answers

Answer: find the answer in the explanation

Explanation: The potential energy in a circuit between two points is the workdone in taking units positive charge from one point to the other in the circuit. Its S.I unit is Joule.

Because voltage of a battery or cell in a circuit is the potential energy difference across its terminal

The potential energy difference between two points is one volt, if the workdone in taking one Coulomb of positive charge from one point to the other is one Joule.

A blow dryer transfers thermal energy mainly by
A. conduction
B. convection
C. radiation
D. specific heat

Answers

Answer:

B

Explanation:

Through air

Answer:

thermal conduction I assume

Explanation:

why because the thermal Insulator: a material that conducts thermal energy poorly. Gives off heat

a bicycle coasts along a flat road. what form of energy does it best demonstrate ​

Answers

Answer:

Kinetic energy

hope this helps:))

A machine with a 5-N input force and a 25-N output force has a mechanical advantage of (I point)
02
05.
O20.
O125​

Answers

Answer:

020

Explanation:

forms of energy!! matching game PLZ I NEED HELP !!!

Answers

6- a
3- d

I don’t know the other sorry

On which of the following objects, all sitting on the ground together, does
Earth exert a greater gravitational pull than a pencil? Check all that apply.
A. A basketball
B. A toothpick
C. A truck
D. A piece of paper
E. Your hand​

Answers

Explanation:

a toothpick

What is the mass of a 600 gram object on the moon

Answers

The object’s mass will be 600 grams on the moon. If you meant it’s weight, it will be 1/6 that of on Earth while on the moon.
It is 1/6 times that on the moon.

100 POINTS! WILL MARK BRAINLIEST FOR CORRECT ANSWER!

Choose one object or instrument. Write a detailed explanation of what happens when a loud and quiet sound is made. Use the words vibration, energy, longitudinal wave, amplitude and particles in your answer.

Answers

Answer:

This extra energy causes the string to vibrate more, which helps it move more air particles for a longer time. A string plucked with force has greater amplitude, and greater amplitude makes the sound louder when it reaches your ear. Volume depends on amplitude. Greater amplitude produces louder sounds.

These waves are often used as a means to transfer digital information such as a text message or website.
A)Infrared
B)Ultraviolet
C)Radio
D)Visible Light

Answers

Answer:The answer is C

Explanation:

The waves are often used as a means to transfer digital information such as a text message or website is radio waves. The correct option is C.

What is digital information?

Digital information generally consists of data that is created or prepared for electronic systems and devices such as computers, screens, calculators, communication devices. These information are stored by cloud.

The wave used for the same purpose is radio waves which has the high frequency range.

Thus, the correct option is C.

Learn more about  digital information.

https://brainly.com/question/4507942

#SPJ5

If you see ##### in a cell, you should
make the row taller
retype the number
type in a different number
make the column wider

Answers

Answer:

it's D. Make the column wider

Explanation:

A squirrel jumps down from a tall tree. Assuming the squirrel is in free fall,
how far will it have fallen in 1.3 seconds?
O A. 6.4 m
B. 13.2 m
O C. 8.3 m
O D. 11.1 m

Answers

Use the formula:
d=.5 x g x t^2

G=9.8 meters per second
t=1.3 seconds

d=0.5×9.8×1.3^2

Answer is C. 8.3 m

Answer:

8.3 m

Explanation:

Giotto used foreshortening in order to:
O A. enhance the importance of his subjects.
O B. make his figures look more realistic.
O C. combine linear and aerial perspectives.
O D. guide the eye of the viewer.
SUBMIT

Answers

Answer:

I think B is the answer.

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