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A block is constrained to move along x-a...

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.

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