The relationship between the distance and time for a car to make a uniform acceleration straight-line motion from standstill can be expressed as s = half a * (the square of T), where a is the acceleration. In one driving, the acceleration of the car is 5m / s, then the time required for a 75 meter journey is () Accurate to 0.1s

s=1/2at^2
t=(2s/a)^1/2=√15=3.9s

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