Engineering Mechanics
The static friction

Bears a constant ratio to the normal reaction between the two surfaces
Is independent of the area of contact, between the two surfaces
All of these
Always acts in a direction, opposite to that in which the body tends to move

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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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