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JAMB Physics 2005 Question 42

Question 42

Elasticity

An elastic material has a length of 36cm when a load of 40 N is hung on it and a length of 45 cm when a load of 60 N is hung on it. The original length of the string is

  1. A.18cm.
  2. B.12cm.
  3. C.20cm.
  4. D.15cm.
Show the answer and explanation

Answer: A (18cm.)

Explanation

An extra 20 N gives 9 cm more, so 40 N gives 18 cm extension. Original length = 36 − 18 = 18 cm.