The force acting on a box varies with time

PHYSICS · Single correct · GCSE · Physics · Energy · Energy

Problem

The force acting on a box varies with time. It increases uniformly from

0\,\text{N}

t = 0

60\,\text{N}

t = 3\,\text{s}

. The box moves

4.5\,\text{m}

along the direction of the force during this time. What is the average power delivered to the box in the

0

3\,\text{s}

interval? (a)

30\,\text{W}

(b)

45\,\text{W}

(c)

60\,\text{W}

(d)

27\,\text{W}