An object travelling at a speed of 36 kmph comes to rest in a distance of 200   m after the brakes were…

An object travelling at a speed of 36kmph comes to rest in a distance of 200 m after the brakes were applied. The retardation produced by the brakes is
  1. 0.25 m s−2
  2. 0.20 m s−2
  3. 0.15 m s−2
  4. 0.10 m s−2

Solution

From the equations of kinematics, v2-u2=2as

Given, u=36 kmph=10 m s-1
and s=200 m

⇒0-102=2×a×200

⇒-100=a×400

⇒a=-0.25 m s-2

Asked in: AP EAMCET 2021 (19 Aug Shift 2)

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