AP EAMCET202119 Aug 2021Evening ShiftPhysicsMotion in One DimensionActual
An object travelling at a speed of 36 kmph comes to rest in a distance of 200 m after the brakes were applied. The retardation produced by the brakes is
Options
- A0.25   m   s − 2
- B0.20   m   s − 2
- C0.15   m   s − 2
- D0.10   m   s − 2
Correct answer
A. 0.25   m   s − 2
Step-by-step solution
From the equations of kinematics, v 2 - u 2 = 2 a s Given, u = 36   kmph = 10   m   s - 1 and s = 200   m ⇒ 0 - 10 2 = 2 × a × 200 ⇒ - 100 = a × 400 ⇒ a = - 0 . 25   m   s - 2