A 54.0-kg projectile is red at an angle of 30.0 above the horizontal with an initial speed of 1.44 x 1.02 mfs 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? 6371352 J J (b) Suppose the projectile is traveling 102.1 mls at its maximum height of y = 362 m. How much work has been done on the projectile by air friction? 454105.73 f 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? 122.27 X Your response differs from the correct answer by more than 10%. Double check your calculations. m/s