In this question, we are given that a snowboard pulled up by a tow rope is traveling at a rate of 5 m/s up a mountain. We are asked to find the force applied to it given that 3000 watts of power is used.

Power is defined as the rate at which work is done or energy is transferred. It is measured in watts. The formula to calculate power is:

Power = Force * Velocity

In this case, we are given the power (3000 watts) and the velocity (5 m/s). We need to rearrange the formula to solve for force:

Force = Power / Velocity

Plugging in the given values, we get:

Force = 3000 / 5 = 600 N

Therefore, the correct answer is option 3: 600 N.

The force applied to the snowboard is 600 Newtons.