A car is traveling on a straight, level road under wintry conditions. Seeing a patch of ice ahead of her, the driver of the car slams on her brakes and skids on dry pavement for 50 m, decelerating at 7.5 m/s2. Then she hits the icy patch and skids another 70 m before coming to rest.
A) If her initial speed was 78 mi/h, what was the magnitude of the deceleration on the ice?
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