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Created for Albert.io. All rights reserved 2016.

The box in the diagram is sliding to the right across a horizontal surface, under the influence of the forces shown.

Which force (or forces) is doing negative work on the box?

A

${ F }_{ \text{gravity} }$ only.

B

${ F }_{ \text{friction} }$ only.

C

${ F }_{ \text{gravity} }$ and ${ F }_{ \text{friction} }$.

D

${ F }_{ \text{gravity} }$ and ${ F }_{ \text{normal} }$.

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