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## Main Question or Discussion Point

In projectile motion, we have two components one is x and another is y. x = u cosθ and y = u sinθ

But why do I take the' y' component for calculating the 'time of flight' not the 'x' component?

y = ut sinθ - 1/2 gt^2, t = 2u sinθ / g

But why do I take the' y' component for calculating the 'time of flight' not the 'x' component?

y = ut sinθ - 1/2 gt^2, t = 2u sinθ / g