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A body of mass 10kg moving with a velocity of 5ms1 c...

A body of mass 10kg moving with a velocity of 5ms1 collides with another body of mass 15kg moving in the same direction as the first with a velocity of 2ms1. After collision, the two bodies move together with a common velocity vms1.

A.

3.2

B.

5.3

C.

7.0

D.

8.0

Correct answer is A

Momentum of bodies with common velocity = m1v1+m2v2=(m1+m2)v

(10×5)+(15×2)=(10+15)v

50+30=25vv=8025=3.2ms1