In the experimental setup similar to the one shown during the class demonstration, the small ball is launched from the corner of inclined plane. When the inclination of the plane is 70deg the maximum range of the projectile is 50cm. Later the inclination of the plane changes to new unknown angle and the same projectile launcher is oriented at 30 deg to the horizontal line. The ball lands 1m away from the launcher. Find the new angle of inclination. How do i do it? i tried everything , i tried finding initial speed of the projectile but i get 2 unknows, etc. any suggestion on what to do?