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JAMB Physics 2007 Question 44

Question 44

Motion

A car of mass 1500 kg goes round a circular curve of radius 50 m at a speed of 40 ms−1. The magnitude of the centripetal force on the car is

  1. A.1.2 × 103 N.
  2. B.1.2 × 103 N.
  3. C.4.8 × 103 N.
  4. D.4.8 × 104 N.
Show the answer and explanation

Answer: D (4.8 × 104 N.)

Explanation

F = mv2/r = 1500 × 402 ÷ 50 = 48 000 N = 4.8 × 104 N.