Question

The resultant of two vectors p and q is r if q is doubled

Answer 1

Explanation:

let the resultant be r

and new resultant be R

therefore r=√p²+q²+2pqcos∅

now q becomes 2q

therefore magnitude resultant R

R=√p²+4q²+4pqcos∅

and direction of new resultant

θ=tan-¹(2qsin∅/p+2qcos∅)

Answer 2

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