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

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

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Engineering Mechanics
The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

Newton's first law of motion
Principle of conservation of energy
Principle of conservation of momentum
Newton's second law of motion

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Engineering Mechanics
Non-coplanar non-concurrent forces are those forces which

Do not meet at one point but their lines of action lie on the same plane
None of these
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane

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