The car is traveling at a speed of 60 mi/hr as it approaches point A. Beginning at A, th...

The car is traveling at a speed of 60 mi/hr as it approaches point A. Beginning at A, the car decelerates at a constant 7 ft/sec² until it gets to point B, after which its constant rate of decrease of speed is 3 ft/sec² as it rounds the interchange ramp. Determine the magnitude of the total car acceleration (a) just before it gets to B, (b) just after it passes B, and (c) at point C.