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## Homework Statement

Bob can throw a 500 g rock with a speed of 30 m/s. He moves his hand forward 1.0 m while doing so.

a. How much work does Bob do on the rock?

b. How much force, assumed to be constant, does Bob apply to the rock?

c. What is Bob's maximum power output as he throws the rock?

## Homework Equations

vf^2= vi^2 + 2ad

F=ma

W= F.d

P= F.v

## The Attempt at a Solution

Find the acceration provided by the applied force.

vf^2= vi^2 + 2ad

30^2= 2a (1)

a= 450 m/s^2

Then find the force using newton's second law:

F=ma

F= 450 (0.5)

F= 225 N

Now calculate work using the force applied.

W= F.d

W= 225 *1= 225 J

Power= F.v= 225*30= 6750 W.

Is this the correct way to do it? my textbook doesn't have solutions to even-numbered problems and I'm not sure if my way of calculating acceleration and then using newton's second law is correct. Any help would be greatly appreciated!