A machine delivers power of for the first and for the next

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

Problem

A machine delivers power of

300\,\text{W}

for the first

10\,\text{s}

and

900\,\text{W}

for the next

5\,\text{s}

. What is its average power output over the entire

15\,\text{s}

interval? (a)

600\,\text{W}

(b)

500\,\text{W}

(c)

750\,\text{W}

(d)

450\,\text{W}