webwork 10.9 no 7

Hello Professor Taylor, can you help explain this problem to me I cannot
get the correct answer. I keep getting aprox. 15.7m/s

This is almost exactly the same as problem 6, which is discussed in a previous blog post.  The only difference here is that the angle is 45˚ instead of 30˚, and they give you that y(t)=0 when x(t)=25, and ask you to find v_0 instead of the other way around.  Try the problem with perspective in mind, and let me know how it goes.