The displacement of a trolley moving along a straight track varies with time as…

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

Problem

The displacement

s

of a trolley moving along a straight track varies with time

t

s = 3t

metres for the first

5\,\text{s}

. A constant horizontal force of

20\,\text{N}

acts on the trolley in the direction of motion during this interval. What is the power developed by the force? (a)

30\,\text{W}

(b)

60\,\text{W}

(c)

120\,\text{W}

(d)

100\,\text{W}