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2015-05-31T01:01:18+05:30

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Displacement  at  t =0  is :  x =  4 meters...
displacement at t = 2 sec  is  x = 0 meters..
displacement at  t = 4 sec  is :  x =  2^2 = 4 meters

so the particle travels from x = 4 m to x=0 m  in the first 2 sec... and then  from 0m to x = 4 m position in th next two seconds....

distance travelled = 8 meters.

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