Physics ?? ?? ??

Solution:- Initial velocity (u) = 50 m/s
      Final velocity (v) = 0 m/s    (since the pebble is finally coming at rest)
      Time taken (t) = 5 s
      Retardation (a) = ?              (to be calculated)

      By using the first equation of motion,

      v = u + at

      0 = 50 + a * 5

      - 50 = 5a

       a = -10 m/s2      (negative acceleration means retardation)


      

      


 

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