$(a)$ Differentiate between speed and velocity.
$(b)$ When is a body said to have uniform velocity?
$(c)$ How can we describe the position of an object? Illustrate with a suitable example.

(N/A) Speed is the distance traveled per unit time,whereas velocity is the displacement per unit time. Speed is a scalar quantity and is always positive,while velocity is a vector quantity and can be zero,positive,or negative.
$(b)$ $A$ body is said to have uniform velocity if it covers equal displacements in equal intervals of time,regardless of how small these time intervals may be.
$(c)$ The position of an object is described with respect to a fixed reference point,known as the origin. For example,if a bird is flying,its position can be described relative to a specific tree or the ground (the reference point).