2. A 2.0-kg block was released from rest at point A. It then moves through point B until it finally stops at point C. The plane is inclined at an angle 0 of 32.0° from the horizontal and the incline stands at a height h of 3.0 m. The coefficient of kinetic friction from point A to B is 0.40. A h 8.0 m В (a) What is the velocity of the block at point B? (Ans.: 4.6 m) (b) What is the coefficient of friction for the horizontal surface (from point B to C)? (Ans.: 0.13)

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Newton's First Law of Motion

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!