Solution:
Let v be the speed of projectile at the highest point. By conservation of angular momentum and conservation of mechanical energy, we have
A projectile of mass m is fired from the surface of earth at an angle from the vertical. The initial speed of the projectile is where M and R are mass and radius of the earth. Find the height by the projectile in kilometer. Neglect air resistance and the rotation of earth. (Given R = 6400 km)
Let v be the speed of projectile at the highest point. By conservation of angular momentum and conservation of mechanical energy, we have