a body whose mass is 40kg runs up a flight of 30 steps each 150mm high in 6 second fine the average power developed

Answer 1

Looks like this question was asked several times already.

Answer 2

work done in lift = m g h = 40 * 9.81 * 30 * 0.150 Joules
power = work/time
so divide work done in Jouless by 6 to get Watts

Answer 3

good

Answer 4

good

Answer 5

good work