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A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial...

A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 142 m/s from the top of a cliff 118 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.)

(b) Suppose the projectile is traveling 100.6 m/s at its maximum height of y = 328 m. How much work has been done on the projectile by air friction?

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