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

2.5 km/hour

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20 km/hour

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40 km/hour

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50 km/hour

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Solution

The correct option is C
40 km/hour

According to principle of conservation of linear momentum
$1000 \times 50 = 1250 \times v \Rightarrow v = 40 k m / h r$

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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

The correct option is C 40 km/hour According to principle of conservation of linear momentum 1000×50=1250×v⇒ v=40 km/hr

The correct option is C
40 km/hour

According to principle of conservation of linear momentum
$1000 \times 50 = 1250 \times v \Rightarrow v = 40 k m / h r$