An bag of sand is raised from the ground to a balcony high

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

Problem

8\,\text{kg}

bag of sand is raised from the ground to a balcony

4\,\text{m}

high. Student A pulls the bag vertically upward, while Student B drags it up a smooth ramp of length

6\,\text{m}

leading to the same balcony. Take

g = 10\,\text{m/s}^2

. Which statement about the work done by each student against gravity is correct? (a) Student A does

320\,\text{J}

of work, Student B does

0\,\text{J}

of work. (b) Student A does

320\,\text{J}

of work, Student B does

480\,\text{J}

of work. (c) Both students do

320\,\text{J}

of work. (d) Both students do

80\,\text{J}

of work.