Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Do not meet at one point and their lines of action do not lie on the same plane
Meet at one point and their lines of action also lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane

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

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