A 52.0-kg projectile is fired at an angle of 30.0deg above, Ask an Expert

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A 52.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.26 102 m/s from the top of a cliff 126 m above level ground, where the ground is taken to be y = 0.

What is the initial total mechanical energy of the projectile?

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