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A bullet of mass 0.02 kg is moving with ...

A bullet of mass 0.02 kg is moving with a speed of `10 ms^(-1).` It can penetrate 10 em of wooden block, and comes to rest. If the thickness of the target would be 6 cm only find the KE of the bullet when it comes out

Text Solution

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`"For x"=100cm=0.1m,Fx=1/2mv_(1)^(2)=1J`
`therefore F=10N`
`"For"x=6cm=0.06m,Fx=1/2mv_(1)^(2)-1/2mv_(2)^(2)`
`"or " Fx=1/2mv_(1)^(2)-"Final K.E."`
or `"Final K.E."=1/2 mv_(1)^(2)-Fx=1-10xx0.06=1-0.6=0.4J"`
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