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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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a
-28 m/s; -4 m/s
b
-20 m/s; -4 m/s
c
20 m/s; 24 m/s
d
28 m/s; –4 m/s
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Correct option is A
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