What is tangential acceleration and its magnitude 12. if a projectile that was launched from the ground with an initial velocity 100 m/s in the direction 30° north of east collides a rocket that was fired due east 4s after the projectile reached its highest point, how high up was the rocket fired and with what velocity given that the rocket has a constant velocity and was fired when the projectile was over head? 13. a car has a constant acceleration of 0.300 m/s2 and a horizontal velocity of 8.00 m/s at the moment the care is at the top of the rise of the roadway that is shaped like a circle of radius 500 m. what is the magnitude and direction of the total acceleration vector for the car at this instant?