Imagine that Chris, whose mass is 45 kg, has fallen into a crevasse in a glacier. Chris's partner Pat, whose mass is 65 kg, has thrown a rope to Chris and intends to lift Chris out by holding on to the other end of the rope while sliding down the glacier’s icy slope which is tilted at an angle of 35o with respect to the horizontal. Assume that Pass has used some camping equipment to cobble together a pretty good pulley to change the rope’s direction at the lip of the crevasse. Also assume that Chris hangs freely when suspended below the lip of the crevasse. Is it possible for Pat to pull Chris out, considering the likely coefficients of friction involved? Pat has a 30-kg backpack. Could this help?

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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!