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Mass (m)= 50kg

g= 10m/s

no. of steps= 45

height (h)= 15cm or 0.15 m

total displacement= 45*0.15

= 6.75

Power= Work/time

work= mgh

Therefore, w= 50*10*6.75 / 9

= 3375/9

Power of the boy= 375 Joules.

Pls mark as 5 star if it helped!

g= 10m/s

no. of steps= 45

height (h)= 15cm or 0.15 m

total displacement= 45*0.15

= 6.75

Power= Work/time

work= mgh

Therefore, w= 50*10*6.75 / 9

= 3375/9

Power of the boy= 375 Joules.

Pls mark as 5 star if it helped!