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

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

All of these
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.
The velocity, with which a projectile is projected, is known as the velocity of projection.

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Engineering Mechanics
One joule means that

Work is done by a force of 1 g when it displaces a body through 1 cm
Work is done by a force of 1 dyne when it displaces a body through 1 cm
Work is done by a force of 1 kg when it displaces a body through 1 m
Work is done by a force of 1 N when it displaces a body through 1 m

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