Apr 22, 2019 · Acceleration – Time Equations of Uniformly Accelerated Motion If a body starts with velocity (u) and after time t its velocity changes to v, if the uniform acceleration is a and the distance travelled in time t in s, then the following relations are obtained, which are called equations of uniformly accelerated motion. a) the centripetal acceleration of the mass. b) the tension in the string. 8. It takes a 900. kg racing car 12.3 s to travel at a uniform speed around a circular racetrack of radius 90.0 m. What is the centripetal force acting on the car, and which force provides it? 9.