A box is to be shifted from point to point

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

Problem

A box is to be shifted from point

P

to point

Q

5\,\text{m}

apart along the east–west line. A constant force of

50\,\text{N}

is applied due east on the box. (i) If the box is pulled directly along the straight line joining

P

and

Q

, what is the work done by the force? (ii) If instead the box is pulled along a semicircular track of length

7.9\,\text{m}

that also starts at

P

and ends at

Q

, what is the work done by the same force? Choose the correct pair. (a)

250\,\text{J},\;395\,\text{J}

(b)

250\,\text{J},\;0\,\text{J}

(c)

250\,\text{J},\;250\,\text{J}

(d)

177\,\text{J},\;177\,\text{J}