A plastic glass has a square cross section measuring (2 frac{1}{2}) in. on a side and is

Question:

A plastic glass has a square cross section measuring $2 \frac{1}{2}$ in. on a side and is filled to within $1 / 2$ in. of the top with water. The glass is placed in a level spot in a car with two opposite sides parallel to the direction of travel. How fast can the driver of the car accelerate along a level road without spilling any of the water?

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