Question

if you exert a force of 700n to walk 6m up a flight of stairs in 6s how much power do you use

Answer 1

We know, P = F * d/t
Here, F = 700 N
d = 6 m
t = 6 s

Substitute their values, 
P = 700 * 6/6
P = 700 * 1
P = 700 watt

In short, Your Final Answer would be 700 watts

Hope this helps!