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Q.

A long spring is stretched by 2 cm; its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be:

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a

U25

b

U2

c

5U

d

25U

answer is D.

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Detailed Solution

P.E ∝x2

U1U2 = x12x22

UX = 4100X = 25U

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