A race car goes around a level, circular track with a diameter of 1.00 km at a constant speed of 90.0 km/h. What is the car's centripetal acceleration in m/s2? If you drop an object from a height of 1.5 m, it will hit the ground in 0.55 s. If you throw a baseball horizontally with an initial speed of 30 m/s from the same height, how long will it take the ball to hit the ground?