Question

When 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

• A. U/5
• B. 5U
• C. 10U
• D. 25U

Answer 1

Answer: (D)

25U

Answer 2

$U =\frac{1}{2} K (2)^{2} ; U '=\frac{1}{2} K (10)^{2}=25\, U$