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Q.

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)

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answer is 1.5.

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Detailed Solution

By the conservation of momentum40×10+(40)×(−7)=80×v⇒v=1.5 m/s
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