Consider the motion diagram. it illustrates a car's velocity (v) and acceleration (a). the best description of a car’s velocity in this diagram is:

Correct option is B.

B)  A car's velocity decreased from 10m/s to 5m/s.

Velocity is the vector quantity i.e. It needed both direction and magnitude to define it. Velocity is actually the rate of change of subject with respect to some frame reference.

Acceleration is the rate of change of velocity with respect to its velocity. The standard unit of velocity of meter per second square.

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