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JAMB Physics 1987 Question 14

Question 14

Elasticity

A load of 5 N gives an extension of 0.56 cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20 N?

  1. A.1.12 cm
  2. B.2.14 cm
  3. C.2.24 cm
  4. D.2.52 cm.
Show the answer and explanation

Answer: C (2.24 cm)

Explanation

Extension is proportional to load: 0.56 × 20/5 = 2.24 cm.