A block of mass m = 5.7 kg is pulled up a θ = 26° incline as in the figure below with a force of magnitude F = 35 N.   (a) Find the acceleration of the block if the incline is frictionless. (Give the magnitude of the acceleration.)m/s2(b) Find the acceleration of the block if the coefficient of kinetic friction between the block and incline is 0.12. (Give the magnitude of the acceleration.) m/s2

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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!