Question

Derive the expressions for the magnitude and direction of a resultant of two vectors acting at a point.


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Answer 1

If two vectors acting simultaneously at a point can be represented both in magnitude and direction by the adjacent sides of a parallelogram drawn from a point, then the resultant vector is represented both in magnitude and direction by the diagonal of the parallelogram passing through that point.

Answer 2

Answer:

R=√(a^2+b^2+2abcosx).

this is the formula for parallelogram law of vector addition.