# physics

A boy throws a ball up into the air with a speed of 12.3 m/s. The ball has a mass of 0.25 kg. How much gravitational potential energy will the ball have at the top of its flight? (Assume there is no air resistance.)

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1. same as the KE at the start:
1/2 * .25 * 12.3^2

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2. what do you get from the answer because i get 30

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3. 18.9 J

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4. 18.9 J !!!! #APEX

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