The driver of a car is initially moving at a constant speed of77.4 km/h when a t

Question

The driver of a car is initially moving at a constant speed of77.4 km/h when a traffic light turns red.If a 0.520 s reaction time is requiredbefore the brakes can be applied, what is the distance in meterstraveled by the car before it begins to slow down?
The driver of a car is initially moving at a constant speed of77.4 km/h when a traffic light turns red.If a 0.520 s reaction time is requiredbefore the brakes can be applied, what is the distance in meterstraveled by the car before it begins to slow down?

Explanation / Answer

car is initially moving with a speed is v0 = 77.4 km / h                                                                 = 0.278 * ( 77.4 km /h)                  ( 1 km / h = 0.278 m/s )                                                                 = 21.5 m/s                              time t = 0.520 s                         distance travelled   d = v0 * t                                                           = 21.5 m/s * 0.520 s                                                           = 11.1 m

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