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Q.

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

$m_{1} u_{1} = (m_{1} + m_{2}) v 1000 \times 50 = 1250 \times v \Rightarrow v = 40 km / hr$

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