The distance ( s ) travelled by a particle in time $t$ is given by $S=4 t^2+2 t+3$. The velocity of the particle, when $t=3 \mathrm{sec}$ is
- A26 unit/sec
- B20 unit/sec
- C24 unit $/ \mathrm{sec}$
- D30 unit/sec
✓ Correct answer: A
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