In the pinewood-derby event shown, the car is released from rest at the starting position A and then rolls down the incline and on to the finish line C. If the constant acceleration down the incline is 2.75 m /s² and the speed from B to C is essentially constant, determine the time duration t_AC for the race. The effects of the small transition area at B can be neglected.

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-20° A B 3 m . -4 m- Problem 2/13