Laws Of Motion Question 34

Question: 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 [MP PMT 1994]

Options:

A) 2.5 km/hour

B) 20 km/hour

C) 40 km/hour

D) 50 km/hour

Show Answer

Answer:

Correct Answer: C

Solution:

According to principle of conservation of linear momentum $ 1000\ \times 50=1250\ \times v $

therefore $ v=40km/hr $



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