5. Atwood's Machine. A 15.0-kg load of bricks hangs from one end of a rope that passes over a small, frictionless pulley. A 28.0-kg counterweight is suspended from the other end of the rope, as shown in the figure. The system is released from rest. (a) What is the magnitude of the upward acceleration of the load of bricks? (b) What is the tension in the rope while the load is moving? S 0.45 m/s^2 1.02 m/s^2 1.45 m/s^2 2.96 m/s^2 No Anguer 28.0 kg 15.0 kg

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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!