Question a 560-kg projectile is fired at an angle of 300deg, Ask an Expert

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Question: A 56.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.44 multiply.gif 102 m/s from the top of a cliff 134 m above level ground, where the ground is taken to be y = 0.

Part A: What is the initial total mechanical energy of the projectile?

Part B: Suppose the projectile is traveling 102.1 m/s at its maximum height of y = 350 m. How much work has been done on the projectile by air friction?

Part 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?

I need help to find the initial total mechanical energy of the projectile.

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