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- Calculate the potentional energy of a 5.2 kg object positioned 8 m above the ground.A slingshot fires 3600 stone per hour with a velocity of 2296.59 ft/s if each stone has a mass of 50g find the power developed by the slingshot?A projectile hits the ground at an angle of 30 degrees below the horizontal with an energy of 113715 Joules. The mass of the projectle is 0.7kg. Assuming that this projectile was launched from the ground some distance away,what is the maximum height reached by projectile