Speed in a given direction is called
a.
thrust.
c.
mass.
b.
velocity.
d.
acceleration.

Speed is a scalar measure (ex: 5 m/s) and only has magnitude 
If you add a direction to it (ex: 5 m/s East) you are making it a vector 

Velocity is a vector. 

Notice the difference in notation: 
Velocity is represented by a V with an arrow above 

Speed is represented by either a V or a U with no arrow above (because the arrow signifies that it is a vector) 

Velocity

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