Question: The roller-coaster track shown is contained in a vertical plane. The portion of track between A and B is straight and horizontal, while the portions

The roller-coaster track shown is contained in a vertical plane. The portion of track between A and B is straight and horizontal, while the portions to the left of A and to the right of B have radii of curvature as indicated. A car is traveling at a speed of 72 km/h when the brakes are suddenly applied, causing the wheels of the car to slide on the track ((k = 0.20). Determine the initial deceleration of the car if the brakes are applied as the car

(a) Has almost reached A,

(b) Is traveling between A and B, (c) has just passed B.

The roller-coaster track shown is contained in a vertical plane.

-30 m 45 m

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