Question

A boy whose mass is 40kg runs up a flight of 30 steps each 150mm high in 6seconds. Find the average power developed (take g as 10m/s^2.

Answer 1

g=a=10m/s^2,

M=40kg,

S=150mm/1000=0.15m*30steps each=4.5m,

F=ma=40*10=400N

.'. Power=W/t=F*s/t=F*V=1800/6 = 300W Ans// or 0.3kW Ans//

Answer 2

work done = m g h = 40 * 9.81 * 30 * 0.150 Joules

power in Watts = work done / 6 seconds

Answer 3

Thanks so much for your assistance

Answer 4

0.3kw

Answer 5

k.e=1/2mv^2

1*0.75*12^2divide by 2=54j

Answer 6

Thanks helped with my assignment

Answer 7

what is the kinetic energy of a 0.75 kg apple falling at 12m\s?

Answer 8

Thank you very much

Answer 9

THE QUESTION AND THE ANSWER.

Answer 10

I WANT THE PHYSICS QUESTION AND THE ANSWER.