PhysicsA car moving with a speed of 20 ms−1 can be stopped by applying brakes, after travelling a distance of 2 m. The retardation of the car is :

A car moving with a speed of 20 ms−1 can be stopped by applying brakes, after travelling a distance of 2 m. The retardation of the car is :

  1. A

    50 m/s2

  2. B

    100 m/s2

  3. C

    150 m/s2

  4. D

    200 m/s2

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    Solution:

    Initial velocity, u = 20m/s
    Final velocity, v =0 m/s
    Distance travelled s = 2m, 
    a = ?

    We know v2u2=2as

    a=v2u22s=04002×2=100 m/s2

    ∴ Retardation(−a)=100m/s2

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