A block is constrained to move along the -axis under a force

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A block is constrained to move along the

x

-axis under a force

F=\frac{4}{x^2}

, where

x\ne0

. Here,

F

is in newtons and

x

is in metres. Find the work done by this force when the block is displaced from

x=4\,\text{m}

x=2\,\text{m}