Question

Two forces A and B have a resultant R. If B is
doubled the new resultant R, is at right angles
to A. Then​

Answer 1

Explanation:

this is the ans

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Answer 2

Explanation:

given A2 + B2 + 2AB cos\alpha [/tex] = R2

When 2B is made R and A become Perpendicular

so taking as vectors, we can see that the base and height is A and R and the hypotenuse will be vector 2B so that R and A become Perpendicular

Then we get

$A = -2Bcos \alpha$

substituting its value in 1

we get B=R