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**niharika_kumar****Member**- From: Numeraland
- Registered: 2013-02-12
- Posts: 1,062

a particle is moving on a circular path with constant speed v.Find the change in velocity when it moves through 120°?

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Change in velocity? Do you mean instantenous acceleration or average?

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,574

hi Niharika

Diagram below. What is not clear to me is how you are supposed to express this. (in terms of what coordinate system).

If I had this problem and no more information I would call the original vector V1 = v.i where i is a unit vector in that direction. Then find V2 in terms of i and j.

Bob

ps. Looking again at the diagram, it would probably have been better if I had put V1 going the other way so it is positive i, but too late. I'm sure you can re-jig it yourself.

*Last edited by bob bundy (2014-05-11 19:46:42)*

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**niharika_kumar****Member**- From: Numeraland
- Registered: 2013-02-12
- Posts: 1,062

yes, I got it.

thanks

friendship is tan 90°.

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