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## Homework Statement

a kitten pushes a ball of yarn rolling toward it at 1.00 cm/s with its nose, displacing the ball of yarn 17.5 cm in the opposite direction in 2.00 s. What is the acceleration of the ball of yarn?

## Homework Equations

## The Attempt at a Solution

i used x=1/2(Vi+Vf)t to find the final velocity and i got 16.5.

than i used the vf=vi+at and got 7.75m/s^2 for the acceleration but my teacher told me its wrong so i have no clue like what i did wrong?