Acable pulls an 201 kg safe up a slope inclined at 24 , for 12 m on an very slippery oily surface. The safe starts and ends at rest a) What is the work done by the normal force? b) What is the work done by the gravitational force? OWhat is the work done by the cable?

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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!