Question

If the resultant of two unequal vectors is equal to the sum of
their magnitudes, the angle between the vectors is
(a) 90°
(c) 0°
(b) 180°
(d) None of these​

Answer 1

Answer:

velocity and speed. option c is correct answer

Answer 2

Explanation:

Let  A and B  be two unequal vectors and θ be the angle between them.Therefore according to given :

A+B=√(A²+B²+2ABcos θ)

Squaring on both sides, we get

(A+B)²=A²+B²+2ABcos θ

A²+B²+2AB=A²+B²+2ABcos θ

2AB=2ABCosθ

Cosθ=1

∴ Cosθ=Cos0°

∴  θ=0°