Engineering Mechanics
The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

t = 2u sin (α - β)/g cos β
t = 2u sin (α + β)/g cos β
t = g cos β/2u sin (α + β)
t = g cos β/2u sin (α - β)

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Engineering Mechanics
The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

Different at different points on its line of action
Maximum, if it acts at the center of gravity of the body
Same at every point on its line of action
Minimum, if it acts at the center of gravity of the body

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Engineering Mechanics
Which is the correct statement about law of polygon of forces?

If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon, then the forces are in equilibrium
If any number of forces acting at a point can be represented in direction and magnitude by the sides of a polygon taken in order, then the forces are in equilibrium
If a polygon representing forces acting at a point is closed then forces are in equilibrium
If any number of forces acting at a point can be represented by the sides of a polygon taken in order, then the forces are in equilibrium

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