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A truck weighing 1000 kg is moving with ...

A truck weighing 1000 kg is moving with velocity of 50 km/h on smooth horizontal roads. A mass of 250 kg is dropped into it. The velocity with which it moves now is

A

12.5 km/h

B

20 km/h

C

40 km/h

D

50 km/h

Text Solution

Verified by Experts

The correct Answer is:
B
According to law of conservation of linear momentum
`m_1 v_1 = (m_1 + m_2) v_2`
` v_2 = (m_1v_1)/(m_1 + m_2) = (1000 xx 50)/(1250) = 40 km//h`
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