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How long does it take?

 
A car travelling at 7.0 m/s accelerates uniformly at 2.5 m/s^2 to reach a velocity of 12.0 m/s. How long does it take for this acceleration to occur?
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1 Answer

t = Δv / Δa

t = (12 - 7) / (2.5 - 0) = 2 seconds