# Work/energy problem

1. Mar 3, 2012

### Mdhiggenz

1. The problem statement, all variables and given/known data

A man applies 50N downward force on a 9.8N
hammer. V0=5.0m/s. Stopped by a nail in d=0.50cm
• Assuming constant acceleration: Fnail/hammer
=?

2. Relevant equations

3. The attempt at a solution

I am completely stumped on how to start this problem. What I have done so far is.

Make two free body diagrams one for the force being applied by the man and one for the hammer.

I know the nail is 0.005m

I know I have to do some form of wtotal= K2-K1

I tried solving for K using 1/2mv^2 and since the acceleration is constant K1 will be 0 , and I rearranged the formula wtotal= k2-k1 to be wtotal +0=k2

I have no idea what else I can do. Guidance will be greatly appreciated.

Higgenz

2. Mar 3, 2012

### DukeLuke

If the acceleration is constant what does this tell you about the force creating the acceleration? Is it changing in time? What is the relation between force, distance parallel to the force, and work?