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A wagon weighing 1000 kg is moving with ...

A wagon weighing 1000 kg is moving with a velocity 50 `km//h` on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now is

A

50 km/h

B

12.5 km/h

C

40 km/h

D

20 km/h

Text Solution

Verified by Experts

The correct Answer is:
C
Initial velocty = Final momentum of the system
`thereforeAtimesB+Ctimes0=(A+C)timesv`
`thereforev=(AB)/(A+C)`
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