Question

A block is constrained to move along x-axis under a force `F=-2x. Here, F is in newton and x in metre. Find the work done by this force when the block es desplaced from`x=2m to `x=-4` m.

Answer 1

Correct Answer - A::B
`W=int_(2)^(-4)Fdx =int_(2)^(-4)(-2x)dx`
`=[x^(2)]_(2)^(-4) =-[16-4] =-12J`