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Question

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

A
10m/s
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B
7m/s
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C
3m/s
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D
1.5m/s
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Solution

The correct option is D 1.5m/s
Since there is no external force, momentum would remain conserved.
By the conservation of momentum:
Pi=Pf
m1v1+m2v2=(m1+m2)v
40×10+(40)×(7)=80×vv=1.5m/s

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