Two particles are projected vertically upwards with the same velocity on two different planets with accelerations due to gravity $g_1$ and $g_2$ respectively. If they fall back to their initial points of projection after lapse of times $t_1$ and $t_2$ respectively,then
- A$t_1 t_2 = g_1 g_2$
- B$t_1 g_1 = t_2 g_2$
- C$t_1 g_2 = t_2 g_1$
- D$t_1^2 + t_2^2 = g_1 + g_2$
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