Question

Two forces of magnitude Aand B are acting at right angle to each other. The magnitude of their resultant is *​

Answer 1

Explanation:

√ A^2 + B^2 = resultant force

cos 90° = 0 so 2ABcostheta is 0

I hope it is helpful for you

Answer 2

Answer:

$r = \sqrt{ {a}^{2} + {b}^{2} }$

Explanation:

theta=90°

therefore, cos(90°)=0

$r = \sqrt{ {a}^{2} + {b}^{2} + 2ab \times \cos(theta) } \\ but \: theta = 90 \\ therefore \: \: cos(90) = 0 \\ \: r = \sqrt{ {a}^{2} + {b}^{2} + 0 } \\ r = \sqrt{ {a}^{2} + {b}^{2} }$

hope it helps pls mark brainliest...