A 2 kg mass moving with a velocity of 10ms−1 collides with another 6 kg mass moving in opposite direction with a velocity of 20ms−1. After the collision, they stick and move together. Their common velocity is m/s and the momentum is kg m/s.
A
12.5
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B
7.5
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C
50
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D
100
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Solution
The correct option is D 100 m1u1+m2u2=(m1+m2)v(2)(10)−(6)(20)=(8)v⇒v=1008m/s=12.5m/sp=8v=100kgm/s