Which of the following are vector quantities?

The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys.

A smooth cylinder lying on its convex surface remains in __________ equilibrium.

Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity āvā is made to strike the second ball. Both the balls after impact will move with a velocity

The centre of gravity of a right circular solid cone is at a distance of _________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)

ā