4. A purple penguin is being dragged along the ground by a rope which makes a 25° angle with the horizontal. If the tension in the rope is 8N, the weight of the penguin is 30N, and the coefficient of kinetic friction between penguin and ground is μK = 0.2. Find the acceleration of the penguin, and say whether the penguin is speeding up, slowing down, or moving at constant speed. L Penguin y 25°

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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!