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 $
