11. A 2.0-kg piece of gelatin is made to slide down a ramp from point a to point b, as shown. The total distance between points a and b is 2.0 m while the vertical distance between the same points is 0.80 m. If the ramp is frictionless, (a) what force does work on it and (b) how much work does this force do? a b. 12. One of the fastest pitches in baseball is recorded at 45 m/s. If this pitch were directed upwards instead of horizontally, to what height would it have travelled? Ignore the effects of air resistance. Werk dore by Non-Conservative Forces

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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!