A wagon weighing 1000 kg is moving with a velocity 50km/h on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now is
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a
2.5 km/hour
b
20 km/hour
c
40 km/hour
d
50 km/hour
answer is C.
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Detailed Solution
According to principle of conservation of linear momentum m1u1=m1+m2v 1000 ×50=1250 ×v⇒v =40 km/hr