1. A 55 kg man runs up the stairs below in 5 seconds. How many watts of power did he use? 2. A 55 kg man runs up the stairs below in 5 seconds. How can he reduce the power he uses?

Explanation:

Power = Force * distance/time

Given

mass = 55kg

Force = 55 * 10 = 550N

Let the distance covered be 8m

time taken = 5secs

Required

Amount of Power used

Power = 550 * 8/5

Power = 110 * 8

Power = 880 Watts

2) The way he can reduce the amount of power expended is to reduce the amount of stairs or the distance covered in a specified period of time.

compass can be used day and night, cloudy or sunny

i think it's 35 meters