Engineering Mechanics
According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

Their lines of action are at equal distances
Their algebraic sum is zero
The algebraic sum of their moments about any point in their plane is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point

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Engineering Mechanics
Which of the following statement is correct in connection with projectiles?

A path, traced by a projectile in the space, is known as trajectory.
The angle, with the horizontal, at which a projectile is projected, is known as angle of projection.
All of these
The velocity, with which a projectile is projected, is known as the velocity of projection.

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