$A$ body is projected vertically upwards. The times corresponding to a specific height while ascending and while descending are $t_{1}$ and $t_{2}$ respectively. Then the velocity of projection is (where $g$ is acceleration due to gravity).
- A$g \sqrt{t_{1} t_{2}}$
- B$\frac{g t_{1} t_{2}}{t_{1}+t_{2}}$
- C$\frac{g \sqrt{t_{1} t_{2}}}{2}$
- D$\frac{g(t_{1}+t_{2})}{2}$
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