1) a jetliner is moving at a speed of 270 km/h. the plan then decelerates at 4.5 m/s2. what is the minimum runway length on which this aircraft can land
2) if the contraction of left ventricle of the heart lasts 250ms and the rate of flow of the blood in the aorta is 1.0 m/s. Why is the average acceleration of a red blood cell as it leaves the heart?