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JAMB Physics 1994 Question 16

Question 16

Elasticity

A force of 15 N stretches a spring to a total length of 30cm. An additional force of 10 N stretches the spring 5cm further. Find the natural length of the spring

  1. A.25.0cm
  2. B.22.5cm
  3. C.20.0cm
  4. D.15.0cm
Show the answer and explanation

Answer: B (22.5cm)

Explanation

10 N gives 5 cm, so 15 N gives 7.5 cm extension. Natural length = 30 − 7.5 = 22.5 cm.