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Q.

A body of mass m1 moving with uniform velocity of 40 m/s collides with another mass m2 at rest and then the two together begin to move with uniform velocity of 30 m/s. The ratio of their masses m1m2 is

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a

0.75

b

1.33

c

3.0

d

4.0

answer is C.

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Detailed Solution

Initial momentum of the system = m1×40+m2×0 Final momentum of the system = (m1+m2)×30By the law of conservation of momentumm1×40+m2×0=(m1+m2)×30⇒40m1=30m1+30m2⇒10m1=30m2=m1m2=3
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