Question

17. A car is travelling at a speed of 72km/h, the brakes are applied so as to produce a uniform
acceleration of -1m/s2. Find the distance it travels after applying brakes so that it
completely stops?

Answer 1

Final velocity, V=0
72km/h = 20 m/s [since, 72x5/18]

From, v=u + at
0 = 20-t
t=20s
From, s=ut + 1/2 at^2
s = (20) (20) - 1/2(1) (400)
s = 200 m