Question

I will give medal and fan, but I need explanation.

You apply a horizontal force of 10.0 N to pull a wheeled suitcase at a constant speed of 0.5m/s across a flat ground. How much power is used?

I know that power is equal to work/time, but I don't know how to get the time.

Answer 1

You don't need all that fancy stuff. You can use it for the derivation, but it includes calculus I believe.
Power = Force*Velocity
Voila.

Answer 2

Yes, Power = Force * Velocity.
iPwnBunnies, You don't need calculus if both the force and velocity are constant because they both come outside of the integral.
Source: https://en.wikipedia.org/wiki/Power_%28physics%29#Mechanical_power

Answer 3

Power p=w/t=F*s/t=F*v=10*0.5=?

Answer 4

Unit of power is watt=w