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 tan α
½ sin α
2 cos α
½ cos α

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Applied Mechanics and Graphic Statics
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

Bears a constant ratio to their velocity of approach
Is equal to the sum of their velocities of approach
Is directly proportional to their velocity of approach
Is inversely proportional to their velocity of approach

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