Suppose a car is traveling at +20.3 m/s, and the driver sees a traffic light turn red. after 0.207 s has elapsed (the reaction time), the driver applies the brakes, and the car decelerates at 7.00 m/s2. what is the stopping distance of the car, as measured from the point where the driver first notices the red light?

33.6371 m

Explanation:

t = Time taken

u = Initial velocity = 20.3 m/s

v = Final velocity

s = Displacement

a = Acceleration = -7 m/s²

Distance traveled in the 0.207 seconds

Distance = Speed × Time

⇒Distance = 20.3×0.207 = 4.2021 m

Equation of motion

Distance traveled by the car while braking is 29.435 m

Total distance measured from the point where the driver first notices the red light is 29.435+4.2021 = 33.6371 m

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