## anonymous 4 years ago The 4 kg head of a sledgehammer is moving at 6 m/s when it strikes a spike driving it into a log. The duration of the impact is 2 ms. Find the time average of the impact force.

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1. UnkleRhaukus

impulse is the change in momentum

2. anonymous

Yes, but where does impulse come here?

3. anonymous

It's basic newton's second law. $F=\frac{m(v-u)}{t}$ You know m, v (=0), u and t.

4. anonymous

What do you mean by time average of impact force?

5. anonymous

@rajathsbhat you have given the way to find the force, but that is not what they are asking here.

6. anonymous

hmm i just noticed that.....i'm not too sure of what means though...

7. anonymous

*what it means

8. anonymous

Please help, this sum has been frustrating me for hours .... don't even know what it means ...

9. anonymous

perhaps it's simply F/t?