Since you have shown no work, I see no way of saying whether you have done it properly or not!
I got the following final answers. Am I right?:
1) I'm assuming it is right since I end with 2sec (θ) = 2sec (θ)
2) θ = π/3
3) The valve will be located 61.92cm above the ground after 3 min.
Please tell me if I am wrong because my teacher gave these questions as practice for the test and if I get them wrong then that means I will do bad on my test!
Thanks in advance!