Question

Q.12
A particle is moving in a circle of radius r centre
at O with constant speed v the change in velocity
moving from A to B (ZAOB = 40°) is -
(1) 2v cos 40°
(2) 2v sin 40°
(3) 2v cos 20°
(4) 2v sin 20°
plz explain me​

Answer 1

Answer:

4

Explanation:

according to formula

$2a \sin( \frac{ \alpha }{2} )$

Answer 2

Explanation:

In order to do this type of sums.....U must be aware of Vectors.....

Vectors are quantities which gives us both the magnitude as well as the directions!

• U should also know how to find the resultant of two vectors

We can find the resultant of two vectors By the Cosine ;

[ Laws Of Vector]

That means

R = √ (A² + B ² 2 AB Cos Theta)

Hope this helps u, Plzzzz do mark me as Brainliest if it helps u!