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Q.

A steel ball of radius 2 cm is at rest on a frictionless surface. Another ball of radius 4 cm moving at a velocity of 81 cm/sec collides elastically with first ball. After collision the smaller ball moves with speed of (cm/s)

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answer is 144.

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Detailed Solution

Ratio in radius of steel balls = 1/2So, ratio in their masses =18      [As M∝V∝r3]Let m1=8m and  m2=mv2=2m1u1m1+m2=2×8m×818m+m=144 cm​/​s
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