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

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

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

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