A motor car travelling at 14m/s on dry flat surface should be able to stop in 14m.Assuming the deceleration to be uniform.

Question

Given: its value and the corresponding bracking time is -7m/s^2 , 2 sec

Calculate the distance travelled during the first second after the application of the brakes.

Answer 1

V = Vo + a*t = 14 - 7*1 = 7 m/s.

V^2 = Vo^2 + 2a*d.
7^2 = 14^2 - 14*d, d = ?.