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you are testing a new roller coaster ride in which a car of mass m moves around a vertical circle of radius r . in one test, the car starts at the bottom of the circle (point a) with initial kinetic energy ki . when the car reaches the top of the circle (point b), its kinetic energy is ki/4 , and its gravitational potential energy has increased by ki/2 . what was the speed of the car at point a, in terms of g and r ?

Sagot :

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