Position $x$ of a particle at any instant is related with velocity as $v = \sqrt {2x + 9}$ . The particle starts from origin. Then initial acceleration and velocity are
- A$1\,\, unit$, $3\,\, unit$
- B$2\,\, unit$, $3\,\, unit$
- C$4\,\, unit$, $81\,\, unit$
- D$9\,\, unit$, $3\,\, unit$
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