A 6kg mass moving with a velocity of 20ms−1 collides with another 2kg mass moving in opposite direction with a velocity of 10ms−1. The momentum of system is.
A
140kgms−1
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B
50kgms−1
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C
100kgms−1
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Solution
The correct option is C100kgms−1 Let: m1=6kg, m2=2kg, : u1=20ms−1, u2=−10ms−1(negative sign indicates that body is moving in oppostie direction) ∴ Momentum of system: m1u1+m2u2=(6)(20)−(2)(10) ⇒100kgms−1