•an object moves in a straight line, starting from
rest. there are two stages in the journey:
(a) it gains speed uniformly for 2.0s and
attains a speed of 8.oms":
(b) it continues at this speed for a further 1.5s.
draw a sketch-graph of speed against time.
find (i) the acceleration in stage (a);
(ii) the acceleration in stage (b);
(iii) the total distance moved during stage:
(a) and (b).

(i)The acceleration in stage (a) = slope of OA, that is

\frac{AD}{OD}  = \frac{8}{2}  = 4mx^{-2}

(ii) The acceleration at stage (b) =0, since there speed was not changing

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can you explain it better