# Ana B

### Dropped tennis ball! Please help me to solve this problem... thanks a lot?

After you drop a tennis ball of 0.5 kg from rest at a height of 3.8 m onto a hard floor, find the fallowing:

a) what will be the speed of the ball at the instant of contact with the floor?

Thank you!

v=8.63m/s

b) what force does the floor exert on the ball?

(f)=?N

c) Over what time does the force act in bringing the ball to rest?

(delta)t=?s

Thanks!

2 AnswersPhysics1 decade ago### Dropped tennis ball - please help?

After you drop a tennis ball of 0.5 kg from rest at a height of 3.8 m onto a hard floor, find the fallowing:

a) what will be the speed of the ball at the instant of contact with the floor?

v=8.63m/s

b) what force does the floor exert on the ball?

(f)=?N

c) Over what time does the force act in bringing the ball to rest?

(delta)t=?s

Thanks!

2 AnswersPhysics1 decade ago### How to find the force of a bullet?

A bullet of mass 0.0018 kg initially moving at 486 m/s embeds itself in a large fixed piece of wood and travels 0.54 m before coming to rest. Assume that the acceleration of the bullet is constant.

What force is exerted by the wood on the bullet? (in Newtons)

3 AnswersPhysics1 decade ago