55/6 = 9.16666...mph/s
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-10 mph/sec
-4 mph/sec (Study Island Answer)
It all depends upon the acceleration. A fast car can probably do it in under 10 seconds. Driving economically would take much longer. A jet plane can do it quicker.
a = (vf - v0)/Δt 10 mph/s = (45 mph - 20 mph)/Δt Δt = 2.5 s
About 163 mph