Posted by dem on Monday, October 22, 2012 at 1:49pm.
since v changed by 6m/s in 4 s, a = 6/4 = 1.5 m/s^2
That is, every second, v increased by 1.5 m/s. After 4 seconds, it had increased by 6 m/s, from 6 to 12.
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