Question

what all ways the velocity of the body can be changed

Answer 1

Hey there ! ☺

The Ways by which velocity of body can be changed.
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♤ If speed or direction changes.
       Whenever, one of the Component including speed or direction changes, Velocity of the body change. It is a possible cause to this to be done.
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♤ If speed ups or slows down.
If Speed downs, acceleration too decreases. As the result velocity also changes. Same happens, if speed increases.
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☺☻☺

Answer 2

what all ways the velocity of the body can be changed-

1. By changing direction.
2. By changing magnitude.
3. By changing both direction as well as magnitude.