A railroad car is moving in the +x direction on a straight and level track. A person in the railroad car throws a ball. The ball follows trajectory shown, relative to the railroad car. From an inspection of the trajectory, what can be concluded about the motion of railroad car? Treat y-axis along vertical.

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if railroad car is slowing down then (it is retarding) car will be non-inertial frame and apply pseudo in forward direction. So in car frame particle will accelerate horizontally.

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