A 10 kg box is pulled along the x axis on a non-uniform rough surface by a force of 100 N which makes 60 degrees angle above the horizontal. The frictional force changes linearly as kx along the x-axis where k=0.5 N/m. Starting the motion from the origin, what is the rate of energy consumption (in units of W) by the frictional force at x-10 m ? Take g=10m/s?. O A) 48.7 O B) 11.2 O C) 65.6 O D) 50 E ) 64.6

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