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A spring loaded gun is used to shoot a 1.3 kg ball from a rooftop. When the gun is fired, a compressed spring will be released shooting the ball into the air. The ball will travel in a parabolic path eventually striking the ground below. The gun is at an angle of 39° above the horizontal. The spring has a spring constant of 1500 N/m and has been compressed by 0.8 m. The ball is 13 m above the ground when it leaves the gun. Air resistance is not present.
A) How much Elastic Energy does the gun have before being fired?


B) How much Kinetic Energy does the ball have as it leaves the gun?
C) What is the ball's velocity as it leaves the gun??
D) How much Gravitational Energy does the ball have as it leaves the gun?
E) How much Kinetic Energy does the ball have at its highest point? HINT: If you know the balls velocity as it leaves the gun you should easily be able to figure out the ball's velocity at its highest point.
F) How much Gravitational Energy does the ball have at its highest point?
G) How high is the ball above the ground at its highest point?
H) How much Kinetic Energy does the ball have as it hits the ground?
I) How much Gravitational Energy does the ball have as it hits the ground?

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