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A 0.5kg stone is whirled on the end of a 1.2 m string in a vertical circle at a constant speed of 6.0 m/s. a) calculate 1)the highest point of its circular path 2) the lowest point of its circular path b) calculate the force exerted on the stone by the string at 1) the highest point of its circular path 2(the lowest point of its circular path​