- Choice C
Given the final speed, vf (which is 220 fps), and the initial speed, vi (which is 88 fps), and you know the time needed (3 seconds), you can find the acceleration, a. Because vf – vi = a⋅t
vf – vi = a⋅t
⇒ 220 - 88 = 3a
⇒ a = 44
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