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A 1kg ball moving at 12 ms-1 collides head on with a 2kg 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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-28 m/s; -4 m/s
-20 m/s; -4 m/s
20 m/s; 24 m/s
28 m/s; –4 m/s

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detailed solution

Correct option is A

v1=m1-em2m1+m2u1+1+em2u2m1+m2=-28 m/s

v2=1+em1u1m1+m2+m2-em1m1+m2u2=-4 m/s

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