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Q.

A 1 kg ball moving at 12 m/s collides head on with a 2 kg ball moving in the opposite direction at 24 m/s. The velocity of each ball after the impact, if the coefficient of restitution is 2/3 is

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a

-28 m/s ; -4 m/s

b

28 m/s ; -4 m/s

c

20 m/s ; 24 m/s

d

-20 m/s ; -4 m/s

answer is A.

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Detailed Solution

v1→=m1-em2m1+m2u1→+m2(1+e)m1+m2u2→ v2→=m1(1+e)m1+m2u1→+m2-em1m1+m2u2→
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