On a planet far, far away, an astronaut picks up a rock. The rock has a mass of 5.00 kg, and on this particular planet its weight is 40.0 N. The astronaut exerts an upward force of 46.2 N on the rock. a) Draw the free body diagram for the rock, b) Find the net force exerted on the rock, c) What is the acceleration of the rock?

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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!