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{"ops":[{"insert":"The skier with mass m = 80kg climbs 400m with telescope on the track, which forms the angle a = 30\u2070 with the horizontal direction. On the skier, through the telescope, the force F = 700N is exerted, which forms the angle fi = 45\u2070 with the track. The friction force that the snow exerts on the skier is f = 50N. Find: a) The work done by each of the forces acting on the skier. \n"}]}
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