Same with problem https://www.physicsforums.com/threads/trigonometric-problem.76696/ . My problems here is I cannot came up with the same answers in the book. I didn't solve using vectors. 2. Relevant equations I would like to know the equation on the 4th hint although I have different solution. It might help me get to the answers. 3. The attempt at a solution The attempt solution is attached on this post. I have the values of radial velocity and transverse velocity but I cannot came up with the answers 12.26 (a) 5770 m; (b) 263 m/s; (c) 18.86◦ (for B and C).