When a long spring is stretched by 2cm, its potential energy is U. If the spring is stretched by 10cm, the potential energy stored in it will be
When a long spring is stretched by 2cm, its potential energy is U. If the spring is stretched by 10cm, the potential energy stored in it will be
A. 25U
B. U/5
C. 5U
D. 10U
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Correct Answer - A
`U prop x^(2)`
`(U_(2))/(U_(1))=(x_(2)^(2))/(x_(1)^(2))rArr (U_(2))/(U)=10(2)^(2)=25 rArr U_(2)=25U_(1)=25U`
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