Two cranes each lift a concrete slab of mass vertically through

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

Problem

Two cranes each lift a concrete slab of mass

500\,\text{kg}

vertically through

4\,\text{m}

. Crane A completes the lift in

8\,\text{s}

, while Crane B takes

5\,\text{s}

. Which crane is more powerful? (a) Both cranes have equal power (b) Crane B only (c) Power cannot be compared with the given data (d) Crane A only