Please answer this question asap...

Solution : 

The type of motion represented by OA is uniform acceleration (option b).
A body is said to possess uniform acceleration if it's velocity increases by equal amount in equal  interval of time.
(ii) The type of motion represented by BC is negative acceleration or uniform retardation (option c).
An object is said to be moving with uniform deceleration (negative acceleration) if it decreases its velocity by equal amount in equal interval of time. 

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