A 56.0-kg projectile is fired at an angle of 30.0°?

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A 56.0-kg projectile is fired at an angle of 30.0°?



A 56.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.44 102 m/s from the top of a cliff 130 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 102.1 m/s at its maximum height of y = 346 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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