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JAMB Physics 1982 Question 50

Question 50

Elasticity

A 10 g mass placed on the pan of a spring balance causes an extension of 5 cm. If a 15 g mass is placed on the pan of the same spring balance the extension is

  1. A.3.3 cm
  2. B.6.5 cm
  3. C.7.5 cm
  4. D.10.8 cm
  5. E.15.0 cm
Show the answer and explanation

Answer: C (7.5 cm)

Explanation

By Hooke's law extension is proportional to load: 5 × 15/10 = 7.5 cm.