Question

a boy have mass 35 kg runs up a flight of 30 steps each 20 cm height in 5 seconds calculate the power expended . ( answer me in steps plxx )​

Answer 1

Answer:

Below is the answer

Explanation:

The work Done by the boy in climbing a distance h against gravity is

W=mgh

Here,h=30(20cm)=600cm=6m

So,the work done by the man is

W=(35)(10)6=2100 joules

The power is rate of doing work

The power developed by the boy is

P=w/t=2100/5=420W