Question
      
        The displacement of a particle as a function of time is shown in figure. It indicates that
  
      
       A.
        the velocity of the particle is constant throughout              
       B.
        the acceleration of the particle is constant throughout              
       C.
        the particle starts with a constant velocity and is accelerated              
       D.
        the motion is retarded and finally the particle stops                 
              
            
                Answer :  
        the motion is retarded and finally the particle stops      
             Solution :
        From displacement-time graph, it is clear that  in equal intervals of time displacements are  not equal infact, decreases and after $$40\,s$$  displacement constant i.e. the particle stops.