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                In a closed system of a cannon and cannonball  which changes would both result in an increase in the kinetic energy of the cannonball when fired from the cannon?
            
            
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    1. Increasing the mass of the cannonball
2. Increasing the velocity of the cannonball
3. Increasing the mass of the cannon
4. Increasing the length of the cannon barrel
    
2. Increasing the velocity of the cannonball
3. Increasing the mass of the cannon
4. Increasing the length of the cannon barrel
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