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A student is standing on the open platfo...

A student is standing on the open platform of a moving trains at a speed of `10m//s`. The student throws a ball into the air along a path that the, he judges to make an initial angle of `60^(@)` with the horizotal and to be in line with the track. The professor, who is standing on the ground nearby, observes the ball to rise vertically. Find the height reached by the ball.

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