Uniform Circular Motion Question!

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On a circular racetrack, a car travels 2.0km at a speed of 120 km/h in completing one lap.

A) What is the change in velocity in one quarter of a revolution?
B) What is the change in velocity in half a revolution?

Thanks for the help.
 

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Redbelly98
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Welcome to PF.

Just to let you know our forum policy on homework help:
"Any and all assistance given to homework assignments or textbook style exercises should be given only after the questioner has shown some effort in solving the problem. If no attempt is made then the questioner should be asked to provide one before any assistance is given."

So, what thoughts do you have on how to do the problem?

p.s. the full Physics Forum guidelines are here:
https://www.physicsforums.com/showthread.php?t=5374
 

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