Applied Mechanics and Graphic Statics
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

½ cos α
2 cos α
½ sin α
½ tan α

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Applied Mechanics and Graphic Statics
Periodic time of body moving with simple harmonic motion, is

Inversely proportional to the square of its angular velocity
Directly proportional to its angular velocity
Directly proportional to the square of its angular velocity
Inversely proportional to its angular velocity

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