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JAMB Physics 1987 Question 4

Question 4

Newton's Laws and Momentum

A jet engine develops a thrust of 270 N when the velocity of the exhaust gases relative to the engine is 300 m s−1. What is the mass of the material ejected per second?

  1. A.81.00 kg
  2. B.9.00 kg
  3. C.0.90 kg
  4. D.0.09 kg
Show the answer and explanation

Answer: C (0.90 kg)

Explanation

Thrust = mass ejected per second × exhaust speed, so mass per second = 270/300 = 0.9 kg.