any instant on the curve. y-csin(x) Prob. 12-86 12-87. The skateboard rider leaves the ramp at A with an initial velocity v at a 30° angle. If he strikes the ground at B. determine A and the time of flight. 1 m 30 5 m Prob. 12-87 *12-88. The pitcher throws the baseball horizontally with a speed of 140 ft/s from a height of 5 ft. If the batter is 60 ft. away, determine the time for the ball to arrive at the batter and the height / at which it passes the batter.