Physics

Problem

A runner of mass

70\,\text{kg}

reaches the top of a staircase

5\,\text{m}

high in

4\,\text{s}

and is still moving with a speed of

2\,\text{m\,s}^{-1}

at the top. Take

g = 10\,\text{m\,s}^{-2}

. Determine the average power developed by the runner. a)

945\,\text{W}

875\,\text{W}

910\,\text{W}

1.40\times10^{3}\,\text{W}