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The  trolley has an acceleration  a =  2 cm / sec²      down the inclined plane.   
its initial velocity  is    u =  0 m/sec.  as it starts from rest.

   v =  u  +  a  t    =  0 + 2  * t
         =  2 *  3  =  6   m /sec
     this velocity is along the inclined plane direction.
we need to specify the direction as velocity is a vector quantity.
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