# Science

A Stone of 5 kg falls from the top of a cliff 50 m high and buries 1m in sand. Find the average resistance offered by the way sand and the time taken to penetrate.

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1. force*distance=energyfromfalling= mgh
force=5*9.8*50/5 N

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bobpursley
2. time:
force*time= mass*changeinvelocity

change in velocity:
1/2 m vf^2=mgh
vf=sqrt(2gh)

time= mass*sqrt(2gh)/forceabove

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bobpursley

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