Correct Answer: Option A

Explanation

Original length = 20m
first new length = 20.01m

first increase in length = 20.01m - 20m = 0.01m

Second new length = 20.05m
second increase in length = 20.05 - 20m = 0.05m

From hooke's law = \( \frac{F_1}{e_1} = \frac{F_2}{e_2}\)

\(\implies \frac{50}{0.01} = \frac{F_2}{0.05}\)

\(\implies F_2 = \frac{50 \times 0.05}{0.01} = 250N \)

There is an explanation video available below.

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