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A body of mass 0.03 kg , falling from a ...

A body of mass `0.03 kg` , falling from a height of 20 m, penetrates 1.5 m into the soil. Find the average resistive force of the soil.

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Decrease in potential energy of the body when it comes to rest
`=mgh =0.03xx9.8 xx(20+1.5)=6.32 J`
Let the average resistive force of soil =F
`therefore Fxx 1.5 =6.32 or, F =4.21 N`.
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