Question

The resultant of two vectors of magnitude 80 units and 60 units acting perpendicularly to each other has a magnitude of : A. 70 units B. 20 units C. 800 units D. 140 units​

Answer 1

Answer:

answer is 100 units

but it's not in the options

$resultant \: of \: two \: vectors \: inclined \: at \: anangle \: \alpha = \sqrt[2]{ {a}^{2} + {b}^{2} + 2ab \: cos{ \alpha } }$

here angle is 90 so cos90 become 0

so answer =✓[80×80+60×60]=100