3. A car is driven over a hill of radius of curvature 120 m and then into a valley of radius of curvature 80.0 m. The driver keeps the speed of the car constant throughout the entire time. The driver has a mass of 75.0 kg, and he is sitting on a scale. As he drives over the hill, the scale reads 525 N. (a) How fast is he driving? (b) What does the scale read at the bottom of the circular valley? Fom 120m

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