Q.

A 60 kg boy lying on a surface of negligible 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?

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a

2.4 J

b

72 J

c

1.2 J

d

36 J

answer is C.

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Detailed Solution

m1v1=m2v2; KE=12m2v22
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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Best Books for NEET
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