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## Homework Statement

An object moving with a constant acceleration travels 13 m in 7.8 s. The acceleration is then changed and the object covers an additional 34 m in 1.7 s. What is the average acceleration of the object over the entire interval described?

## Homework Equations

X

_{f1}= 1/2(v

_{o}+v

_{f})t

a=(v

_{o}+v

_{f})/t

## The Attempt at a Solution

v

_{f1}=2(13)/7.8

v

_{o}=2(34)(1.7) - 44.2

a = (115.6-44.2)9.5

im not sure how to solve this problem