PhysicsA body falls for 5s from rest. If the acceleration due to the gravity of earth ceases to act, The distance travels in the next 3s is.

A body falls for 5s from rest. If the acceleration due to the gravity of earth ceases to act, The distance travels in the next 3s is.

  1. A

    73.5 m

  2. B

    294 m

  3. C

    147 m

  4. D

    49 m

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    Solution:

    Initially, the body starts its motion from rest therefore, u=0
    Velocity v,  when the object falls for 5 seconds before acceleration due to gravity is ceased:
    v=u+at
      =0+9.8×5=49m/s

    Just before the acceleration stops acting the velocity of the body is 49m/s
    Now the distance travelled by the body in the next 3s
    Now, g= 0 m/s

    s=ut+12gt2
    49×3+12×0×t2  
    = 49 x 3 = 147 m

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