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Q. With what least speed must you toss a 200 g ball straight up to hit the 12.0 m-high roof of the gymnasium if you release the ball 1.30 m above the ground? Solve this problem using energy.

Q. A spring has a force constant of 323 N/m and an unstretched length of 6 cm. One end is attached to a post that is free to rotate in the center of a smooth table, as shown in the top view below. The other end is attached to a 4-kg disk moving in uniform circular motion on the table, which stretches the spring by 1-cm.

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