A commuter backs her car out of her garage with an acceleration of 1.40 m/s2.She accelerates until she is moving at 2.00 m/s. If she then brakes to a stop in 0.800s, what is the magnitude of that acceleration, in m/s2? A helicopter blade spins at exactly 100 revolutions per minute. The tip is 5.00 m from the axis of rotation. What is the average velocity, in m/s, of the tip of the blade over the course of one revolution? A helicopter blade spins at exactly 100 revolutions per minute. The tip is 5.00 m from the axis of rotation. What is the average speed, in m/s, of the tip of the blade relative to the rest of the helicopter