First slide

Work

Question

A spring when stretched by 2 mm its potential energy becomes 4 J. If it is stretched by 10 mm, its potential energy is equal to

Moderate

A

4 J
B

54 J
C

415 J
D

None

Solution

$U = \frac{1}{2} {kx}^{2}$ if x becomes 5 times then energy will become 25 times i.e. $4 \times 25 = 100 J$

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