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

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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 degree above the horizontal with an initial speed of 1.24 102 m/s from the top of a cliff 146 m above level ground, where the ground is taken to be y = 0. What is the initial total mechanical energy of the projectile? J Suppose the projectile is traveling 87.9 m/s at its maximum height of y = 306 m. How much work has been done on the projectile by air friction? J 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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raise the points .. i will help you..its too lengthy for 300pts

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