A roller-coaster car is traveling at a speed of 23 m/s when it passes through point B. At that point, it enters a concave down c
ircular section of the track that has a radius of curvature of 60 m. After it reaches point B, the car’s speed increases at a rate of 4.75 m/s2. Determine the time it takes for the car to reach point D.
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