Posted by **Isis** on Wednesday, January 30, 2013 at 5:50pm.

1.)A ball (m 0.5 kg) starts from rest and has 300 J(joule) of work applied to it.

a) what is the initial kinetic energy of the ball?

b) what is the final kinetic of the ball?

c) what is the final velocity of the ball?

2.)A boy is doing chin-up. If the boy does 450 N of work to lift his body 0.25 m.

a) how much work does the boy do to lift himself up?

b) if he starts from rest, what his final kinetic energy?

c) what is the boy's final velocity?

>> FORMULAS <<

W= Fd

KE=1/2 v^2

PE= mgm

kg.m/s^2.m

kg.m^2/s^2=J

im sorry i don't know which formula to use. please help me! :)

## Answer this Question

## Related Questions

- physics - A bowling ball of mass 7.45 kg is rolling at 2.56 m/s along a level ...
- Physics - A bowling ball of mass 7.45 kg is rolling at 2.56 m/s along a level ...
- physics - A bowling ball of mass 7.45 kg is rolling at 2.56 m/s along a level ...
- Physics - An 8 kg ball is moving at 4 m/s. Work is done on the ball to give it a...
- physics - An 8 kg ball is moving at 4 m/s. Work is done on the ball to give it a...
- physics - work & energy homework problems: please help me =] my teacher is bad a...
- Physics ~please help me! - 1.) A car (m=1200 kg) moves form 2.0 m/s to 15.0 m/s ...
- physics - The physics of a golf ball and kinetic energy. When a 0.045 kg golf ...
- science - the potential energy of a golf ball in a hole is negative with respect...
- Physics - I was wondering if my answers are correct. Thanks in advance. 1. A boy...

More Related Questions