Question

010 A boy of mass 50 kg runs up a staircase of 45 steps in 9 sec If the height of each steps is 15 cm, find his power Take g=10ms​

Answer 1

Answer:

Since, each step of stair case denotes 15cm

So, total height(h) of 45 steps=45×15

=675cm

=6.75m

Work done by the boy=wt×height

w=mg×h

=50×10×6.75

w=3375J

We know that,

Power(P)= Timetaken(T) /workdone(w)

⇒ Power= 3375/9 Js −¹

Power=375w or Js −¹

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