Question

If Ā= 2i^ - j^ and B=i - 2j, find the scalar magnitude and directions of
(1)A
(ii) B and
(iii) A+B​

Answer 1

Answer:

i)√5

ii)√5

iii)√18

Explanation:

A=a i+b j

B=xi+y j

A+B=(a+x)i +(b+y)j

magnitude of A= √(a²+b²)

magnitude of B=√(x²+y²)

magnitude of A+B=√( (a+x)²+(b+x)²)

direction of unit vector of A is= vector A/magnitude of A

i hope YOu understand.............