A toboggan approaches a snowy hill moving at 12.1 m/s. The coefficients of static and kinetic friction between the snow and the toboggan are 0.47 and 0.35, respectively, and the hill slopes upward at 40.0 degress above the horizontal.  1) Find the magnitude of the acceleration of the toboggan as it is going up the hill. Express your answer in meters per second squared.   2) What is the direction of the acceleration as the toboggan is going up the hill?   3) Find the magnitude of the acceleration of the toboggan after it has reached its highest point and is sliding down the hill. Express your answer in meters per second squared.   4) What is the direction of the acceleration as the toboggan is sliding down the hill?

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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!