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A ball is attached to the end of a string hanging from the roof of a...

A ball is attached to the end of a string hanging from the roof of a subway car. The
train goes around a curve, turning to the left. You know that the car is traveling at
60 km/hr.
• Which way will the ball appear to swing? Why?
• If the ball swings at an angle of 15◦, what is the radius of curvature of the curve
in the tracks

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