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Q.

Two identical spheres are placed at two diametrically opposite points of a smooth circular groove in a horizontal plane. One sphere starts with a speed 'u' and collide the other after time '0.2 s'. If the coefficient of restitution of colliding bodies is '0.5'. The minimum time after which they again collides in

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a

0.4

b

0.1

c

0.2

d

0.8

answer is D.

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Detailed Solution

ΔT=2πReu1=2te=2×0.20.5=0.8

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