Can A body have zero velocity and be accelerating?

First question: Yes. Otherwise, if something is not moving, then it will never be able to move.

second question: Yes. Speed is just a number, whereas velocity has a direction too. So if something is going around in a circle, it has a constant speed but its velocity is changing.

Third: No. Reading the explanation to the second answer will tell you that.

To the first question: Not for long.  Acceleration is change in velocity, so even if velocity is zero at some point, if acceleration is not zero, it has to change.  So there can be a momentary condition of zero velocity and finite acceleration

Velocity is a vector and speed is a scalar.  Speed is the magnitude of the velocity vector.  The magnitude of a vector (speed) can be constant, but the vector can change (direction).  However, if the magnitude (speed) of a vector is changing, there is no way for the vector (velocity) to be constant..

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