Can the velocity of a particle vary even if speed is constant?

Read each statement below carefully and state with reasons, if it is true or false: the average speed of a particle is either greater than or equal to the magnitude of average velocity of the particle over the same interval of time.

Is it possible to accelerate a body if its speed is constant?

The escape velocity of a particle of mass m varies directly as

In SHM, the velocity of the particle decreases, as it moves from ______ to ____ position.