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Radius of an iron is 2 cm. The ball is k...

Radius of an iron is 2 cm. The ball is kept at rest on a frictionless horizontal surface. Another ball of radius 4 cm ,moving with velocity `81 cm*s^(-1)` , collides with it. Find the velocities of both the balls after collision.

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The correct Answer is:
`144 cm *s^(-1), 63 cm*s^(-1)`
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