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JAMB Physics 2002 Question 9

Question 9

Newton's Laws and Momentum

A body weighing 80N stands in an elevator that is about to move. The force exerted by the floor on the body as the elevator moves upwards with an acceleration of 5ms−2 is [g = 10ms−2]

  1. A.160 N
  2. B.120N
  3. C.80N
  4. D.40N
Show the answer and explanation

Answer: B (120N)

Explanation

Mass = 80/10 = 8 kg. R = m(g + a) = 8 × (10 + 5) = 120 N.