A 40.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.42  102 m/s from the top of a cliff 146 m above level ground, where the ground is taken to be y = 0. (a) What is the initial total mechanical energy of the projectile?  J (b) Suppose the projectile is traveling 100.6 m/s at its maximum height of y = 356 m. How much work has been done on the projectile by air friction?  J (c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up?  m/s

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