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Two steel spheres approach each other headon with the same speed and collide elastically. After the collision one of the sphere's of radius r comes to rest. The radius of the other sphere is

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a

b

c

d

answer is A.

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Detailed Solution

v2 = 0 Alternative Method:m1v1 + m2 x 0 = m1u + m2(-u)⇒ m1v1 = (m1 - m2)u.........(1) From (1) and (2), 3m1 = m2

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