Question

Somebody explain it plz !!​

Answer 1

Angle between
`\vec{A}` and
`\vec{B}` is 150° .

Now read the question .

The resultant of both vectors is perpendicular to
`\vec{B}`

Look at the attachment

Angle between resultant and vector A be
`\theta`

Let's use maths

`\\ \sf\longmapsto \theta+90°=150°`

`\\ \sf\longmapsto \theta=150-90`

`\\ \sf\longmapsto \theta=60°`

Done