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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

(6)

5/5 - (3 votes)

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