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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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