A box slides down a rough ramp.
The change in the gravitational potential energy of the box is 16 J as it moves between positions X and Y. The box has 24 J of kinetic energy at X and 35 J of kinetic energy at Y.
How much work is done against the frictional force?
$5J$
2 )
$19J$
3 )
$27J$
4 )
$43J$
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