fired -kg projectile the ground is taken to be y = 0. an angle of 30.0° above the horizontal with an initial speed of 136 m/s from the top of a cliff 154 m above level ground, where (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 96.4 m/s at its maximum height of y = 347 m. How much work has been done on the projectile by air friction? (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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