Question

Q13. A vector of magnitude 4 unit rotates through on angle,
of 60°. Then mgnitude of its change is
(1) 2/3 unit
(2) 6 unit
(3) 8 unit
(4) 4 unit​

Answer 1

the magnitude of the change will be the resultant of A-B

|A-B| = √A²+B²-2ABCosTHETA

=√4²+4²-2×4×4×Cos60

= √16+16-32×0.6

=√32-16

=√16

=4

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