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Displacement time graph of a particle moving in a
\( \mathrm{P} \) straight line is as shown in figure.

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(a) Find the sign of velocity in regions oa. ab, bc and cd
(1) Negative, positive, positive, negative
(2) Positive, positive, positive, negative
(3) Positive. negative, positive, positive
(4) Positive, positive, negative, negative
(b) Find the sign of acceleration in the above region
(1) Zero, positive, negative, negative
(2) Positive. zero, negative, positive
(3) Positive, zero, positive, negative
(4) Positive. zero, negative, negative
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