The driver of a moving car suddenly sees ahead a very old man on the middle of the road. To save the old man he applies the brake, which produces an acceleration of 4 m/s² in opposite direction to the motion. After 3 seconds car comes to rest
(i) Calculate the initial velocity and distance travelled by the car.
(ii) If the man is 20 m away from the car, would the driver succeed to save the old man? Explain by calculation.
(iii) What value does the car driver show?
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