Question

When a string is stretched by 0.5 cm, its potential energy is U. If the string is stretched by 2 cm, then its potential energy will be: 

Options

• 4U

• 8U

• 16U

• 32U

Answer 1

16U

Explanation:

U α l²

∴ `"U"_2/"U"_1 = (2/0.5)^2`

= 16

∴ U₂ = 16U