Collisions

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Question

Two bodies having same mass 40 kg are moving in opposite directions, one with a velocity of 10 m/s and the other with 7 m/s If they collide and move as one body, the velocity of the combination is (m/s)

Moderate

Solution

By the conservation of momentum
$40 \times 10 + (40) \times (- 7) = 80 \times v \Rightarrow v = 1 .5 m / s$

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