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10 A ball is thrown vertically upward in the air by a passenger on a train that is moving horizontally with constant velocity of 30.0 m/s. If the ball is given an initial velocity of 10.0 m/s upward with respect to the train, what is the magnitude of the initial velocity of the ball as seen by a stationary observer outside the train? A. 13.5 m/s B. 29.7 m/s C. 31.6 m/s D. 46.3 m/s E. 40.0 m/s
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しーーヤ bservexcorrect option -(C)

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