A car go from 0-60 mi/hr in 8 seconds. During the race, the car travled at a constant speed of 10 mi/hr for 5 seconds before accelerating to its stop speed of 220 mi/hr. During the race, what was the total time it took the car to reach its stop speed?
60 mph = 26.8 meters/s
10 mph = 4.47 m/s
220 mph = 98.3 m/s
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a = 26.8 / 8 = 3.35 m/s^2
spent 5 sec + time to accelerate at 3.35 m/s^2 from 4.47 to 98.3
v = Vi + a t
98.3= 4.47 + 3.35 t
t = 28
so total time = 5 + 28 seconds