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A 60 kg boy lying on a surface of neglig...

A `60 kg` boy lying on a surface of negliguble friction throws horizontally a stone of mass `1 kg` with a speed of `12 m//s` away from him. As a result with what kinetic energy he moves back ?

A

`2.4 J`

B

`72 J`

C

`1.2 J`

D

`36 J`

Text Solution

Verified by Experts

The correct Answer is:
`(3)`
`m_(1)v_(1) = m_(2)v_(2), KE = 1/2 m_(2) v_(2)^(2)`
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