You are riding your bike and steadily pulling your little brother in his red wagon while someone standing still watches you and your little brother go by. he has a ball, and he throws the ball forward at a velocity of 2.5 m/s relative to his body while you are pulling the wagon at a velocity of 4.5 m/s. at what speed does the person who is standing nearby see the ball go by?
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Ответ:
the state of giving off light or glow.