A car moving with a certain velocity comes to a halt if the retardation was 5m/s2. Find the initial velocity of the car.

Let initial velocity be u
  final velocity = u/2
  a = - 5m/s2
v = u + at
u/2 = u -5t
  u = 10t/3
where t is the time and it is not given in the question.

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