A particle moves along the -axis from to under the action of a variable force…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

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}

(b)

-8\,\text{J}

(c)

-4\,\text{J}

(d)

+12\,\text{J}