Question

A spring 40mm long is stretched by the application of force. If 10n force is requiredyo stretch the spring through 1mm then work done in stretching the spring through 40mm is

Answer 1

so , displacement=40mm =0.04m
and F required to stretch 1mm = 10n
so F required to stretch 40mm = 10×40
= 400N
W=f×d
=400×0.04 = 10000J