Den pushes a desk 400 cm across the floor. he exerts a force of 10 n for 8 s to move the desk.

what is his power output? (power: p = w/t)

a. 1.25 w
b. 5 w
c. 40 w
d.500 w

We Know, P = W/t
P = F * s/t
Here, F = 10N
s = 400cm = 4m
t = 8 sec.

Substitute their values in to expression,
P = 10 * 4/8
P = 10 * 1/2
P = 5 Watt

So, your final answer is 5 W

Hope this helps!