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Q.

The bob A of a simple pendulum is released when the string makes an angle of 45° with the vertical. It hits another bob B of the same material and same  mass kept at rest on a table. If the collision is elastic, which of the following statement is correct?

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a

Both A and B rise to the same height.

b

Both A and B come to rest at B.

c

Both A and B move with the same velocity of A.

d

A comes to rest and B moves with the velocity of A.

answer is D.

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Detailed Solution

Due to the same mass of A and B as well as due to elastic collision, velocities of spheres get interchanged after thecollision. So, A comes to rest and B moves with the velocity of A
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The bob A of a simple pendulum is released when the string makes an angle of 45° with the vertical. It hits another bob B of the same material and same  mass kept at rest on a table. If the collision is elastic, which of the following statement is correct?