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## Homework Statement

A car initially traveling due north goes around a semicircle having a radius of 500 m at a constant speed of 20 m/s. A) How long does this take? B) What is the magnitiude and direction of the average acceleration?

## Homework Equations

a = Δv

_{x}/Δt(xhat)+Δv

_{y}/Δt(yhat)

## The Attempt at a Solution

I'm stumped as to how to start this problem. I drew out a half circle with the radius showing 500 m for the distance. I'm not sure if I'm missing a formula or what as I didn't see anything relevant for circles on my formula sheet from my class. Any help is appreciated.