
James B. answered 09/10/15
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A = Change in Velocity (ΔV) divided by Change in Time (ΔT)
A = 2m/s2
ΔV = 20m/s
Therefore time to reach the new speed is
ΔT = ΔV / A
ΔT = 20m/s / 2m/s2
ΔT = 10s