- #1
Ammar w
- 28
- 0
Homework Statement
If two collinear vectors [itex]\vec{A}[/itex] and [itex]\vec{B}[/itex] are added, the resultant has a magnitude equal to 4.0. If [itex]\vec{B}[/itex] is subtracted from [itex]\vec{A}[/itex], the resultant has a magnitude equal to 8.0. What is the magnitude of [itex]\vec{B}[/itex] ?
Homework Equations
None.
The Attempt at a Solution
|A| + |B| = 4.0 (1)
|A| - |B| = 8.0 (2)
sum the two equations :
2|A| = 12
=> |A| = 6.0
substitute in (1) :
6.0 + |B| = 4.0
=> |B| = -2
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is this a complete and right solution??
should I draw the vectors??