Question

(iii) When 0 = 180° i.e. when the two vectors act along opposite directions. From
equation (2.12), we have
Key pc
The mag
R = P2 +Q2 +2P Q cos 180º = P2+Q2 +2P Q (-1) give me answer as soon as possible no spam​

Answer 1

Explanation:

when two vectors act in opposite directions

$\alpha = {180}^{0}$

and

$\cos( \alpha ) = - 1$

Resultant R is

$r = \sqrt{( {p}^{2} + {q}^{2} + 2pq \cos( \alpha )) } \\ = \sqrt{( {p}^{2} + {q}^{2} + 2pq( - 1)}$