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A force F = - kx^(3) is acting on a bloc...

A force `F = - kx^(3)` is acting on a block moving along x-axis. Here, k is a positive constant. Work done by this force is

A

positive in displacing the block from x = 3 to x = 1

B

positive in displacing the block from x = - 1 to x = - 3

C

negative in displacing the block from x = 3 to x = 1

D

negative in displacing the block from x = - 1 to x = - 3

Text Solution

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The correct Answer is:
A, D
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