## pratu043 Group Title 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. one year ago one year ago

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1. UnkleRhaukus Group Title

impulse is the change in momentum

2. pratu043 Group Title

Yes, but where does impulse come here?

3. rajathsbhat Group Title

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

4. pratu043 Group Title

What do you mean by time average of impact force?

5. pratu043 Group Title

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

6. rajathsbhat Group Title

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

7. rajathsbhat Group Title

*what it means

8. pratu043 Group Title

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

9. Shadowys Group Title

perhaps it's simply F/t?