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JAMB Physics 1981 Question 43

Question 43

Elasticity

The extension in a spring when 5 g wt was hung from it was 0.56 cm. If Hooke's law is obeyed, what is the extension caused by a load of 20 g wt?

  1. A.1.12 cm
  2. B.2.14 cm
  3. C.2.52 cm
  4. D.2.80 cm
  5. E.2.24 cm
Show the answer and explanation

Answer: E (2.24 cm)

Explanation

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