A 420-kg projectile is fired at an angle of 300deg above, Ask an Expert

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A 42.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.28*10^2 m/s from the top of a cliff 140 m above level ground, where the ground is taken to be y = 0.

(a) What is the initial total mechanical energy of the projectile?

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