A m1 = 1.90-kg aluminum block and a m2 = 6.85-kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle θ = 35.0°)  For aluminum on steel, μs = 0.61 and μk = 0.47. For copper on steel, μs = 0.53 and μk = 0.36.) The steel block wedge is designed such that the left half of its surface is horizontal while its right half slopes downward, forming an inclined plane of angle θ (measured from the horizontal). A pulley is anchored where the horizontal surface and incline meet. A cord passing over the pulley connects an aluminum block of mass m1 on the horizontal surface to a copper block of mass m2 on the incline. (a) the acceleration of the two blocks m/s2 (b) the tension in the string N

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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!