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JAMB Physics 1987 Question 6

Question 6

Newton's Laws and Momentum

An elevator of mass 4800 kg is supported by a cable which can safely withstand a maximum tension of 60 000 N. The maximum upward acceleration the elevator can have is [g = 10 m s−2]

  1. A.2.5 m s−2
  2. B.5.0 m s−2
  3. C.7.5 m s−2
  4. D.10.0 m s−2
Show the answer and explanation

Answer: A (2.5 m s−2)

Explanation

T − mg = ma, so a = (60 000 − 48 000)/4800 = 2.5 m s−2.