Question

The resultant of u and V is perpendicular
to u and has a magnitude equal to half of
the magnitude of v. The angle between
u &v is
n
(A) 120°
(B) 150°
(C) 90°
(D) 60°​

Answer 1

Answer:

150 I think is the angle

Answer 2

Answer

Correct option is

A

150

∘

According to question:

(

u

+

v

).

u

=0 and

∣

∣

∣

u

+

v

∣

∣

∣

=

2

v

⇒u

2

+

u

.

v

=0 & u

2

+v

2

+2

u

.

v

=

4

v

2

⇒

4

3

v

2

=u

2

→cosθ=−

2

3

⇒θ=150

∘