The roller coaster car has a mass of 600 kg, including the mass of the passengers. At point A, height YA = 29 m, its speed is 12.7 m/s. Find the modulus of velocity: (a) at point B ( YB = 14.4 m); (b) at point C ( YC = 19.1 m). Friction losses and wheel rotation energy are neglected.

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A C A C