Question

a boy of mass 50 kg runs up a stair case of 40 steps in 8 sec. , if the height of each step is 15 cm. find his power

Answer 1

Power=work done / Time
Here workdone in moving up the stairs will be mgh.
Now h will be 40 multiply by 15 = 600m

Time is 8s.

Substitute the values of m, g, h, T to get power..

Hope you get your answer.

Answer 2

$\textbf{\huge{ANSWER:}}$

Given:

Mass = 50 kg

Number of steps = 40

Time = 8 seconds

Height of each step = 15 cm

=》 $\frac{15}{100}$

=》 $\frac{3}{20}$

Power = $\frac{Work}{Time}$

Work = Force × Displacement

Force = Mass × Acceleration due to gravity

Displacement = 40 × $\frac{3}{20}$

=》 $\textbf{6 m}$

Power = $\frac{mg\times s}{t}$

=》 $\frac{50 \times 10 \times 6}{8}$

=》 ${375 W}$

Power = 375 Watt

Hope it Helps!! :)