A science student is riding on a flatcar of a train traveling along a strait, horizontal track at a constant speed of 16ˍm/s. The student throws a ball into the air along a path he judges to make an initial angle of 64° with the horizontal (toward the rear of the car) and to be in line with the track. The student’s professor, who is standing on the ground nearby, observes the ball to rise vertically. With what initial speed does the professor see the ball rise?

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Projectile Motion