PHYSICS MIDDLE SCHOOL

A pole-vaulter is nearly motionless as he clears the bar, set 4.2 m above the ground. He then falls onto a thick pad. The top of the pad is 80 cm above the ground, and it compresses by 50 cm as he comes to rest. What is the magnitude of his acceleration as he comes to rest on the pad

Answers

Answer 1

Answer:

initial height of the pole vaulter = 4.2 m

height of the pole vaulter just before it touch the pad = 80 cm

so the total displacement of pole vaulter just before he will touch the pad = 4.2 - 0.80 = 3.4 m

now by kinematics

$v_f^2 - v_i^2 = 2a d$

$v_f^2 - 0^2 - 2* 9.8*3.4$

$v_f^2 = 66.64$

$v_f = 8.16 m/s$

now after this he will come to rest after compressing the pad by 50 cm

so again we can use kinematics to find its acceleration

$v_f^2 - v_i^2 = 2 a d$

$0 - 8.16^2 = 2*a*0.50$

$a = -66.64 m/s^2$

so here its acceleration will be - 66.64 m/s^2

Related Questions

Why does an object in motion stay in motion unless acted on by an unbalanced force? A) because forces are what stop and start motion B) because balanced forces can not exist in nature C) because motion is the inherent state of all matter D) because motion, once begun, continues to accelerate
Why does sugar sink to the bottom of the teacup (for science btw)
Jenna ran around the school's track with an average speed of 4km/ h How Can Jill get a higher average speed than jenna
Are people renewable?
A cubic centimeter can be expressed as a.cm3 or cc b. ccm c. ccm3 or d.ct

Astronomy can best be described as a/an

Answers

as·tron·o·my- the branch of science that deals with celestial objects, space, and the physical universe as a whole. That's the definition hope it is what you need and that it helps:)

The study of heavenly bodies.

How that differs from astrophysics, astro dynamics, cosmology, etc., I'm not entirely sure.

List 15 different energy sources

Answers

Outlit
Solar pannels stuff like that if thats what your looking for

What is a physical form in which a substance can exist?

Answers

The three physical forms are:

Solid, liquid, or gas.

Which of the following is an important property of stars, because it provides some information about the temperature of a star? Group of answer choices The shape of the star The distance to the star The star's color The star's name

Answers

The star'scolor is an important property of stars because it provides some information about the temperature of a star. The correct option is C.

What does color of star indicates?

A star'shue depends on its temperature; cooler stars seem red, while hotter stars appear blue or white.

This is due to the fact that although stars emitlight over the full spectrum, the predominant hue in the light that we perceive is the color that corresponds to the star's temperature.

The other stated characteristics, such as a star's name, distance from the star, and shape, have no direct bearing on a star's temperature.

However, these characteristics can also provide crucialdetails about the star, such as its size, brightness, and location in the sky.

Thus, the correct option is C.

For more details regarding stars, visit:

brainly.com/question/29359578

#SPJ6

Answer:

The stars color

Explanation:

Scientists know how a Star is by their color like blue is hotter than red

Describe three ways you can conserve energy in your own home

Answers

Turn lights off, unplug electronics, and use solar energy

you can turn off the air conditioning
you can keep all electronics off
you can turn off all running water

Which example best demonstrates the relationship between temperature and pressure?Question 19 options: melting ice, bubbles on a pizza popping when they are cut, bubbles forming in dough when it is heated, or evaporating water

Answers

bubbles forming in dough when it is heated;)

Other Questions

A runner runs a 1,500 m race on a circular track. The runner stops 100 m from the starting point. What are the distance and displacement traveled by the runner

Which statement is false?O Preparations for future situations are helpful to avoid pressured situations.Once you reach adulthood, you will not experience peer pressure.Peer pressure is often thought of in negative terms even though it can be positive.

What is it called when the air particles bunch up

how would your weight change on the surface of an earth sized planet whose mass was greater than earths? why?