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# Zero-Work Forces

APPH12-ZQAYMD

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) does zero 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 ${ F }_{ \text{normal} }$