Question

a man mass is 50 kg moves up 15 steps each of height 15 cm in 45 sec of time calculate power used in climbing the stairs

Answer 1

$\underline\bold {ANSWER}$

Mass = 50kg

Steps = 15

Height = 15cm

Displacement = 15×15 = 225cm = 2.25m

Time = 45secs

Force = mg = 50×10 = 500

So work done = Force × displacement

=> 500 × 2.25

=> 1125 J


Now power = joule / time

=> 1125 / 45

=> 25 watt