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A particle is moving in a circle of radi...

A particle is moving in a circle of radius `r` with speed `v` as shown in the figure. The magnitude of change in velocity in moving from `P` to `Q` is

A

`2v cos 40^(@)`

B

`2 v sin 20^(@)`

C

`2 v cos 20^(@)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
velocity at `p=vhatj`
velocity at Q=-v sin `40^(@) hati+v cos 40^(@) hatj`
magnitude of change in velocity `=2 v sin 20^(@)`
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