CodeCogsEqn (1)

To sketch the K.E. to time graph, we first need to use these two equation to let K.E. be a function of time.

CodeCogsEqn (2)-0

Since it is a quadratic function, so the graph is a parabola(拋物線)

Since the velocity of the x-direction keep unchange(non-zero at any point), so the correct sketch is D.

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