The x components of the average accelerations?

[beamie564]

i got accelerations now of 7.1 and -7.1 m/s^2
is this correct

Still doesn't seem correct. What values of $v_1$ and $v_2$ did you get?

 

[emily081715]

1.204198 and 3.475

 

[SammyS]

1.204198 and 3.475

Those are not correct.

What do those give for the change in kinetic energy?

 

[SammyS]

Or would you have to turn it into 21.904-9.36v1 -v1^2

That last term should be positive:

21.904 - 9.36v₁ + v₁²