Question

A 60 kg person climbs the stairs of height 20m in 10 minutes. Calculate the power delivered. Take $g=10m/s^2$.

• A. 20 W
• B. 10 W
• C. 30 W
• D. 60 W

Answer 1

The correct option is

A

20 W

given

$h=20m$

$t=10min$ , we know 1 min=60 sec

$t=10\times 60sec$

We know, power = $\frac{workdone}{time}$;

= $\frac{mgh}{time}$

= 60 × 10 × $\frac{20}{10\times 60}$;

= 20 Nm/second

= 20 watt.