Help I missed class and don't know what to do

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To determine the speed of a 500 g ball swinging in a vertical circle with a string length of 1.5 m and a tension of 15 N at the bottom of the circle, a free body diagram is essential. The forces acting on the ball include gravitational force and tension. The gravitational force is calculated as mg, which equals 4.9 N for the ball. The net force at the bottom of the circle is the tension minus the weight of the ball, resulting in a net force of 10.1 N. Using the centripetal force equation, the speed of the ball can be calculated to be approximately 3.7 m/s.
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A 500 g ball swings in a vertical circle at the end of a 1.5-m-long string. When the ball is at the bottom of the circle, the tension in the string is 15 N.



What is the speed of the ball at that point in m/s?
 
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start with a free body diagram and the answer will appear
 
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