If the angle of projection is double the angle of inclination (α) of the plane

Question

If the angle of projection is double the angle of inclination (α) of the plane on which particle is projected, the ratio of times of flight up the inclined plane and down the inclined plane, will be

Options:

A . ½ cos α

B . ½ sin α

C . ½ tan α

D . 2 cos α

Answer: Option A

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