A force of 100N stretches an elastic string to a total length of 20cm. If…

A force of 100N stretches an elastic string to a total length of 20cm. If an additional force of 100N stretches the string 5cm further, Find the natural length of the string
  • A.
    15cm
  • B.
    12cm
  • C.
    10cm
  • D.
    8cm
  • E.
    5cm
Correct Answer: Option A
Explanation

Using, f1 = f2
e1 = 20 – L ; e2 = 5cm
(frac{f_1}{e_1}) = (frac{f_2}{e_2})
(frac{100}{20 – L}) = (frac{100}{5})
hence, L = 15cm

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