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A wagon 1000 kg is moving with a velocity 50 km/h on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now is
  • a)
    12.5 km/hour
  • b)
    20 km/hour
  • c)
    40 km/hour
  • d)
    50 km/hour
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A wagon 1000 kg is moving with a velocity 50 km/h on smooth horizontal...
Correct option: (C) 40 km h–1
Explanation:
m1 = 1000 kg
v1 = 50 kmph
m2 = 1000 + 250 = 1250 kg.
v2 = 2
by principle of conservation of momentum,
m1v1 = m2 v2
v2 = {(m1v1) / (m2)}
= {(1000 x 50) / (1250)}
v2 = 40 kmph   
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A wagon 1000 kg is moving with a velocity 50 km/h on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now isa)12.5 km/hourb)20 km/hourc)40 km/hourd)50 km/hourCorrect answer is option 'C'. Can you explain this answer?
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