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A device designed to shoot projectiles consists of a spring with spring constant kmewtons/meter that has been compressed Δx meters. A marble of mass m kilograms is loaded into the device. If the entire device is at an initial height h meters and is moving at an initial velocity v meters/second, which equation best represents the magnitude of the total initial energy E, in joules, of the system?
E=12mgh+12kΔx2+12mv2
E=mgh+kΔx2+mv2
E=mgh+12kΔx2+12mv2
E=mgh+kΔx2+12mv2
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