Jason while driving on Kukum highway at 70 m.s – 1 seeing the traffic light turn red, he applies the brake and comes to rest in a time of 2 seconds. What is his deceleration?

Question

Select one:
a. -17.5 m.s – 2
b. -35 m.s – 2
c. 17.5 m.s – 2
d. 35 m.s – 2

Answer 1

v = Vi + a t
v = 0 at stop
a = -Vi/t = -35 m/s^2

Answer 2

17.5 m/s2