Future War

There is an enemy ship diagonally opposite to your ship behind a planet.Enemy ship is located 2r distance from the centre of the planet of mass M and your ship is 3r distance from the centre of the planet.Concider gravitational field upto 2r from the centre of the planet as it will further nullify by other heavenly bodies.At what angle from the verticle and with what velocity you should project a missile to destroy enemy ship.

r is the radius of the planet .G is universal gravitational constant.

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