Physics

Problem

A particle moves along the

x

-axis from

x=0

x=2\,\text{m}

under the action of a variable force

F_1(x)=3x^{2}\,\text{N}

directed along

+x

. Simultaneously, a constant frictional force

F_2=6\,\text{N}

acts opposite to the direction of motion. The net work done on the particle over this interval is a)

+8\,\text{J}

-8\,\text{J}

-4\,\text{J}

+12\,\text{J}