Question

what is the difference between speed and velocity and indicate if they are scalar or vector quantities

Answer 1

velocity V=(position2-position1)/time, position is a vector, then velocity is a vector too.

Answer 2

speed=the distance covered by an object in unit time is called speed
(speed is scalar)
velocity=the rate of displacement of a body is called its velocity
(velocity is vector)

Answer 3

\[\large Speed=\frac{distance}{time}\]\[\large Velocity=\frac{displacement}{time}\]See the difference?

Speed is scalar because both distance and time are scalar values. Velocity however uses displacement which has both a length (speed) and a direction...so displacement is a vector. Therefore, velocity must also be a vector.