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"1D KINEMATICS"

An amusement park ride features a small electric replica of the ThrustSSC car running on a straight, 600 foot, track. The car always moves with constant acceleration, positive or negative.
You have two controls: A and D. A causes the car to accelerate with constant acceleration, D causes the car to decelerate with constant deceleration. The magnitude of the acceleration is twice the magnitude of the deceleration. There are markings on the side of the track in 1 ft intervals.
To start the car you press control A. How far along the track should you travel before pressing control D so that car will stop exactly at the end of the track?
Explain in words how you came up with your answer.



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