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# Work by Friction Along a Ramp

CLMECH-CXVREJ

A box of mass $m = 1.3$ $kg$ and initial speed $v_o = 2.4$ $m/s$ is pushed up a ramp. The ramp makes angle $\theta = 38^o$ with the horizontal. The coefficient of kinetic friction between the ramp and the box is $\mu_k = 0.27$.

Find the work done by the force of friction during the box's entire motion up the ramp, until it reaches its highest point.

A

$-0.96$ $J$

B

$+0.96$ $J$

C

$+3.7$ $J$

D

$-3.7$ $J$