A stone of mass 5 kg falls from the top of a cliff 50 m high and buries 1 m deep in sand. find the average resistance offered by the sand and the time it takes to penetrate.
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v^2-0=2*10*50
=> v=√1000
0-√1000^2=2*r*1(m)
=>r=-500m/s^2
then from v=u+rt
=>t= 2 seconds
=> v=√1000
0-√1000^2=2*r*1(m)
=>r=-500m/s^2
then from v=u+rt
=>t= 2 seconds
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