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Problem 2.1: Which of these is not an inertial reference frame?

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A ball popper on a cart is shown moving on a track in 4 different animations (position is given in meters and time is given in seconds).  In each animation, the ball is ejected straight up by the popper mechanism at t = 1 seconds. Consider the reference frames that move along with the carts, in other words, a reference frame in which the velocity of the cart is stationary. Which of these is not an inertial reference frame?  Restart.

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