A car is said to go "zero to 55 m/s in six point 8 seconds". What is its acceleration in m/s? A car has a speed of 65.8 m/s. What acceleration would it have if it took 3.7 s to come to a complete stop? A runner accelerates from 4.2 m/s to 9.7 m/s in just 3.6 second. What is the acceleration of the runner? If a car achieved an acceleration of 8.9 m/s in 3 seconds, what was its change in velocity. A had a velocity of 11.9 m/s