A block of mass 1 kg moving at a speed of 2.5 m/s collides with another block of mass 0.5 kg. If both the blocks come to rest after collision what was the velocity of the 0.5 kg block before the collision?
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5 m/s opposite to the direction of motion of the first ball.
Sol From momentum conservation
i.e. 0.5 × v + 1 × 2.5 = 0
5 m/s opposite to the direction of motion of the first ball.
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