Work, Power and EnergyMedium

Question

A spring 40mm long is stretched by applying a force. If 10 N force is required to stretch the spring through one mm, then work done in stretching the spring through 40 mm is :

Options

A.24J
B.8 J
C.56 J
D.64 J

Solution

Force constant,
k = = 104N/m
Work done = kx2 = × 104 ×
= × 104 × = 8 joule

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