Question

can anybody solve this

Answer 1

To get resultant, both vector should be in antiparallel means angle should be 180 between them, 4-3=1 To get magnitude 5 from these vector then, both vector should be perpendicular To get magnitude 7 then these vector should be in same direction means Zero degree angle We can use formula under root of (a)^2+(b)^2+2abcos (theta), theta is tha angle between vectors, we can check our all answer by putting only magnitude of vector and angle. Hence correct answer is first option Hint :-in same direction vectors get add or in apposite direction vectors get substract