Yes, two vectors of different magnitudes can give a zero resultant if they are in opposite directions and have magnitudes that cancel each other out when added together. This is known as vector subtraction.
The magnitudes of momenta are equal since momentum is a vector quantity, determined by both magnitude and direction. If the direction of the momenta are different, the magnitudes will depend on the angle between them.
Yes, two vectors with different magnitudes can be combined to give a zero resultant if they are in opposite directions. However, it is not possible for three vectors with different magnitudes to give a zero resultant because they must have specific magnitudes and directions to cancel each other out completely.
If all magnitudes are different, then minimum is three.
It is certain that two vectors of different magnitudes cannot yield a zero resultant force.
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-- The minimum magnitude that can result from the combination of two vectors is the difference between their magnitudes. If their magnitudes are different, then they can't combine to produce zero. -- But three or more vectors with different magnitudes can combine to produce a zero magnitude.
yeah
no
mAYBE
No.
No. Best case scenario is that they are pointed directly opposite one another, and that is insufficient to cancel by definition of having different magnitudes.