Projectile motion on an Inclined Plane

[LadyMario]

A small ball is launched from the corner of an inclined plane. When the inclination of the plane θ is 70° the max range of the projectile is 50 cm. Later the inclination of the plane changes to a new unknown angle and the same projectile launcher is oriented at 30° to the horizontal line. The ball lands 1m away from the launcher. Find the new angle of inclination.

 

[Simon Bridge]

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