### Evaluate at what speed is the car traveling

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Q. A box slides down a 21° ramp with an acceleration of 1.07 m/s2. Determine the coefficient of kinetic friction between the box and the ramp.

Q. A sports car crosses the bottom of a valley with a radius of curvature equal to 80 {rm m}. At the very bottom, the normal force on the driver is twice his weight. At what speed is the car traveling?

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