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JAMB Physics 1982 Question 34

Question 34

Newton's Laws and Momentum

A rocket burns 0.01 kg of fuel each second and ejects it as a gas with a velocity of 5,000 m/s. What force does the gas exert on the rocket?

  1. A.500,000 N
  2. B.500 N
  3. C.50 N
  4. D.5,000 N
  5. E.50,000 N
Show the answer and explanation

Answer: C (50 N)

Explanation

Force = rate of change of momentum = 0.01 kg s−1 × 5000 m s−1 = 50 N.