A 50.0 - kg projectile is fired at an angle of 30.0° above the horizontalwith an initial speed of 1.20 x 102 m/s from the top ofa cliff 142 m above level ground, where the ground is taken tobe y = 0. (a) What is the initial total mechanical energy of theprojectile? (b) Suppose the projectile is traveling 85.0 m/s atits maximum height of y = 427 m. How much work has beendone on the projectile by air friction? (c) What is the speed ofthe projectile immediately before it hits the ground if air frictiondoes one and a half times as much work on the projectilewhen it is going down as it did when it was going up?

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