The correct description of velocity is:
Velocity is the speed of an object in a particular direction.
The other statements provided do not accurately describe velocity. Here’s a brief explanation of the other statements:
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Velocity is the sum of all of the forces acting on an object. - This describes net force, not velocity.
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Velocity is a force that changes an object's speed and/or direction. - This describes acceleration or force, not velocity.
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Velocity is the resistance of an object to a change in its speed or direction. - This describes inertia or mass, not velocity.
So, the first statement is the only one that correctly defines velocity.