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JAMB Physics 2013 Question 9

Question 9

Work, Energy and Power

An object is moving with a velocity of 5ms−1. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?

  1. A.25.0m.
  2. B.20.0m.
  3. C.1.3m.
  4. D.1.0m.
Show the answer and explanation

Answer: C (1.3m.)

Explanation

mgh = ½mv2, so h = v2/2g = 25 ÷ 20 = 1.25 m ≈ 1.3 m (g = 10 m s−2).