A car is driving 55 miles per hour east. The car changes direction to head north but still travels at 55 miles per hour. Which is true?
The car is following Newton's third law of motion.
The car is not accelerating.
The car is accelerating.
The car is accelerating (during the short time that it's turning from East to North).
ANY change in speed or direction of motion is acceleration. Since the car is changing direction, it is accelerating, even though its speed is constant.
