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Question

A 6 kg mass moving with a velocity of 20 ms1 collides with another 2 kg mass moving in opposite direction with a velocity of 10 ms1. The momentum of system is.

A
140 kg ms1
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B
50 kg ms1
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C
100 kg ms1
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Solution

The correct option is C 100 kg ms1
Let: m1=6 kg, m2=2 kg, : u1=20 ms1, u2=10 ms1(negative sign indicates that body is moving in oppostie direction)
Momentum of system:
m1u1+m2u2=(6)(20)(2)(10)
100 kg ms1

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