Question

A boy weighing 40kg carries a box weighing 20kg to top of building 15m in high in 25s . Calculate the power

Answer 1

Pic have the solution

Answer 2

P=rate of work done= E/T

and E=mgh

therefore,

E= {40+20} * 9.8 * 15

E= 8820 J

now,

P= E/T

P=8820/25

P=352.8 watt