5. 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
(a) 2.5 km/hour (b) 20 km/hour
(c) 40 km/hour (d) 50 km/hour
answer : c
(4)
5/5 - (3 votes)
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