Question

A boy of mass 55 kg runs up a flight of 40 stairs each measuring 15cm.
Calculate
A. Force acting on the boy
B. Work done by the boy
C. Power developed by the boy
D. Power in Horse Power (HP = 750 W)

Please Someone Help me with those Questions.
it's urgent Please help !! ​

Answer 1

Answer:

Force=m×g=40×10=400N

Workdone=F×s

Here we have 15 steps with 15 cm hence total displacement is 225 cm that is 2.25 m

W=400×2.25=900J

Power=work/time

P=900/10=90Watt

Hence we need a power of 90W.