The equation of motion of a stone thrown vertically upward from the surface of a planet is given by $s = 10t - 3t^2$,where the units of $s$ and $t$ are $cm$ and $sec$ respectively. The stone will return to the surface of the planet after:
- A$\frac{10}{3} \text{ sec}$
- B$\frac{5}{3} \text{ sec}$
- C$\frac{20}{3} \text{ sec}$
- D$\frac{5}{6} \text{ sec}$
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