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Q.

A heavy body of mass M moving with a velocity 10m/s collides elastically with a very light body of mass m at rest. The heavy body is brought to rest after the collision. The velocity of light body will be__

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a

1 m/s

b

5 m/s

c

10 m/s

d

0

answer is C.

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Detailed Solution

According to law of conservation of energy 12×M×(10)2=12mv2 ……….(1)According to law of conservation of momentumM×10=mv ………..(2)Divide eq. (1) by (2)v=10m/s
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A heavy body of mass M moving with a velocity 10m/s collides elastically with a very light body of mass m at rest. The heavy body is brought to rest after the collision. The velocity of light body will be__