I can see that the function F is of variables x and y, but your function handle definition does not include the variable x and y in the expression. So, it looks likes that your function appears to be is constant.
Please make the following changes in your function if you want to use baseball and v as a variable for the function handle.
F =@(baseball,v) (baseball * sqrt(v));
Now you will be able to see that values of k1 to k4 are changing.
I hope this helps you to resolve your query.