Interactive LearningWare 6.3 provides a review of the concepts that are importan

Question

Interactive LearningWare 6.3 provides a review of the concepts that are important in this problem. A gymnast is swinging on a high bar. The distance between his waist and the bar is 1.3 m, as the drawing shows. At the top of the swing his speed is momentarily zero. Ignoring friction and treating the gymnast as if all his mass is located at his waist, find his speed at the bottom of the swing. m/s Additional Materials Section 6.5 2. Ask Your Teacher 11 points CJ10 6 P038 The skateboarder in the drawing starts down the left side of the ramp, with an initial sneed of smle Neblas My Notes

Explanation / Answer

The change in potential energy will equal the change in kinetic energy and is

?PE = mg?h = ?KE = ½m?v²

mg?h = ½m?v²
g?h = ½?v²
As he starts from rest, only the final velocity is relevant.
2g?h = v²
v = ?2g?h
v= ?(2(9.81)(2(1.3)))
v = 7.142 m/s

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