hi guys, i got a question about momentum, shouldn't be hard but im not quite sure how to solve, plz help me~~(adsbygoogle = window.adsbygoogle || []).push({});

A pile driver of mass 600kg moving vertically downwards with a speed of 20m/s strikes the top of a vertical pile of mass 6000kg without rebounding. the pile is driven 12cm into the ground by the blow.Calculate(i)the initial velocity of the pile, assuming conservation of momentum during the initial impact;(ii)the work done by ground resistance in stopping the pile.

actually i've already got the answer for(i), if not wrong,it's momentum = 12000J and initial-v = 1.82m/s,the question is how to do (ii)~

cheers guys

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# Homework Help: Basic question about Momentum

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