Three students each lift the same backpack from the floor to a shelf high

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

Problem

Three students each lift the same

10\,\text{kg}

backpack from the floor to a shelf

2.0\,\text{m}

high. Student A takes

1.0\,\text{s}

, student B takes

2.0\,\text{s}

, and student C takes

4.0\,\text{s}

. Which ranking correctly orders the students’ average power outputs, from greatest to least? (a)

C > B > A

(b)

A = B = C

(c)

A > B > C

(d)

B > A > C