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Suppose your friend throws a baseball at an angle of LaTeX: 45^\circ45 ∘above the horizontal. If you are stationary relative to your friend, it will look like the ball follows a parabolic path when viewed from the side. Suppose, instead, that you are riding your bike past your friend as she throws the ball. Assuming you have the same horizontal velocity as the ball, what does the flight path of the ball look like relative to you?

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yesquitpipe

Answer:

A line vertical trajectory

Explanation:

Your friend would look like is going backwards and the ball would be going up and then down with a vertical path with acceleration of gravity downwards.  Same as if you were in a train and throw a ball up. For you it looks normal and vertical, while someone outside the train would see it as a parabolic trajectory.

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