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

• A. 4 J
• B. 54 J
• C. 415 J
• D. None

Answer 1

The correct option is D

None

$U=\frac{1}{2}k{x}^2$ if x becomes 5 times then energy will become 25

time i.e. $4\times 25=100J$