It is the positive square root of its length.
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A vector could describe a something physical like a force or velocity or acceleration or torque for example. The units would be part of the magnitude of the vector. For example, the wind is blowing South at 10 mph. The magnitude is 10 miles per hour.
Yes, acceleration can be positive and negative because acceleration is a vector. It has both direction and magnitude. The direction is what makes it positive or negative. Negative acceleration is usually called deceleration.
No. ' a ' (acceleration) is a vector, but ' m ' (mass) is a scalar.So ' F ' (force) is a vector parallel to ' a ', with magnitude equal to the product ( m |a| ).
3 times the magnitude of the vector V - which is not known.3 times the magnitude of the vector V - which is not known.3 times the magnitude of the vector V - which is not known.3 times the magnitude of the vector V - which is not known.
That depends on what the vector, itself, represents. For example, if the vector represents velocity, then the magnitude of the vector represents speed. If the vector represents displacement, then the magnitude of the vector represents distance.