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## Homework Statement

A particle that is moving along a straight line decelerates uniformly from 0.4 m/s to 0.2 m/s in 5 seconds and then has a constant acceleration of 0.2 m/s^2 during the next 4 seconds. What is the average speed over the whole time interval?

## Homework Equations

vavg = (x - xo)/t

## The Attempt at a Solution

I first broke up the problem into two parts, first part being..."A particle that is moving along a straight line decelerates uniformly from 0.4 m/s to 0.2 m/s in 5 seconds"....I found the deceleration to be -.04m/s^2 by simple plugging into the formula. For the second part..."then has a constant acceleration of 0.2 m/s^2 during the next 4 seconds. What is the average speed over the whole time interval?" Since the acceleration was given to me in that statement I just added the deceleration and acceleration together and divided by two to get the average acceleration. DID I DO THIS CORRECTLY? MY ANSWER WAS .08m/s^2