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I ) OA - uniform acceleration .
AB - uniform motion
BC - uniform retardation
2 ) Retardation of BC :-
We know that retardation is negative acceleration.
a = (v - u ) / t2 - t1
a = ( 0 - 6 ) 16 - 10
a = -6 / 6
a = - 1
therefore retardation is 1 m2 / s
Please mark BRAINLIEST