(a) Force of friction f = ?N = ?mg,
      where m is the massof the
car.
       Aceleration,
                  a
= f/m =?mg/m = ?g = 0.0 x9.8 = 8.82 m/s2
Theditance travelled, S before coming to rest (v = 0)
       S = (v2-
u2)/2a
          =(0
- 22.9x22.9)/2x8.82
         Â
=59.46 m
(b)Â Â Acceleration, a = ?g = 0.25 x9.8 =2.45 m/s2
               u2
= v2 - 2a.S
                  =
0 - 2 x-2.45x59.46 = +291.354
  Initial velocity,
               u
= ?291.354 = 17. 07 m/s
