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## Homework Statement

"Assume that a train is traveling at 65 cm/s, and the track has radius 20cm. What is the

__magnitude__of the train's

__average acceleration__as the train goes from the tree marked A to the next tree B, located exactly 1/4 of the way around the track from tree A? [Hint: This question is not asking for the train's centripetal acceleration.]"

## Homework Equations

Equations of motion of object moving in circle, using ω,∝, θ.

a

_{avg}=(v

_{f}-v

_{i})/Δt

## The Attempt at a Solution

The answer is given to be 190 cm/s

^{2}but why wouldn't it be zero? Maybe I'm misunderstanding the question, but if it doesn't want centripetal acceleration, it must mean tangential acceleration. And I thought that only the direction of tangential velocity changes, not magnitude. I also included a picture.