John is looking to develop a Python program capable of calculating the trajectory of a projectile. The projectile is launched with an initial velocity and angle, aimed at reaching a target positioned at a distance l$2.$ However, there's an obstacle of height h located at a distance l$1$ from the launch point. Given the parameters h $,$ l$1,$ and l$2,$ the task is to write a program that determines the required launch angle and initial velocity to successfully overcome the obstacle and reach the target.