0-kg projectile is fired at an angle of 30.0 above the horizontal with an initial speed of 128 m/s from the top of a cliff 150 m above level ground,...

A 46.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 128 m/s from the top of a cliff 150 m above level ground, where the ground is taken to be y = 0.    

 (a) What is the initial total mechanical energy of the projectile? (Give your answer to at least three significant figures.)