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A car moves in a straight line with constant acceleration. Starting from rest at t=0 it travels 8.0 m in 4.0 s. What is the speed of the car at t= 4 s.

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d = 0.5a*t^2.
8 = 0.5a*4^2, a = 1 m/s^2.

V = Vo + a*t.= 0 + 1*4 = 4 m/s.

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