A heavy metal tray with mass 25.0 kg tray lies on a table. On top of the tray is another stone with mass 12.0 kg. You lift the tray with the stone on it upwards with a force of 500 N. What is the magnitude of the acceleration of the stone? (g=9.8m/s^2) -13.5 -5.5 -3.7 -11.4

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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!