A spring of force constant $800 \mathrm{~N/m}$ has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is (1) 16 J (2) 8 J (3) 32 J (4) 24 J
A spring of force constant $800 \mathrm{~N/m}$ has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is\\
(1) 16 J\\
(2) 8 J\\
(3) 32 J\\
(4) 24 J