A crate is pulled along a straight floor by a constant force of

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

Problem

A crate is pulled

6\,\text{m}

along a straight floor by a constant force of

40\,\text{N}

. For the first

4\,\text{m}

the force makes an angle of

60^{\circ}

with the direction of motion. Without changing its magnitude, the angle is reduced to

30^{\circ}

for the remaining

2\,\text{m}

. Calculate the total work done by the force on the crate. (a)

1.6 \times 10^{2}\,\text{J}

(b)

1.5 \times 10^{2}\,\text{J}

(c)

1.8 \times 10^{2}\,\text{J}

(d)

1.2 \times 10^{2}\,\text{J}