12-121. When the roller coaster is at B, it has a speed of 25 m/s, which is increasing at a, = 3 m/s². Determine the accelration vector of the roller coaster

car at B and the angle 0 of this acceleration vector above the horizontal (x) axis. Ans: atn = (3,7.881),0 = 38.2° 30 m 100-²