The momentum of a body must change when
more than one forces are acting on the body
velocity of the body in constant
balanced forces are acting
unbalanced (external) force is acting
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Explanation:
Balanced forces do not cause a change in motion. When balanced forces act on an object at rest, the object will not move. ... Forces that cause a change in the motion of an object are unbalanced forces. Unbalanced forces are not equal and opposite.
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