If P = 400 N and the coefficient of kinetic friction between the 50-kg crate and the inclined plane is μ = 0.25, determine the velocity of the crate after it travels 6 m up the plane. The crate starts from rest. (Figure 1) Express your answer to three significant figures and include the appropriate units.

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!