I'm not 100% sure but I think the answer is 60.4, because you multiply 3.20 by 10, to get 32 - 9 = 23, then subtract 23 from 83.4. Hope this helps you, and good luck!!!
Please mark brainliest you answer is B).
Have a good night!
Answer:

Explanation:
From the conservation of mechanical energy




Solve to velocity v2




A=(vf-vi)/t
a=(50-25)/10
a=2.5m/s^2