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The kinetic energy release of a swing?
30-kg child clings to a rope and lowering a platform. The initial rate of child is 0, the string is 4 m long and the initial angle of the rope is 60 degrees. a. having the lowest point of the oscillation of the potential energy as 0, kinetic energy is at the point of the child the steps of the platform. b. What is the speed of the child when the chain is at an angle of 30 degrees? c. child speed when passing through the vertical? the issue also called potential energy, but I already calculated at 980 J im confused on how to obtain the velocity and kinetic energy …. I've been working on it for 2 hours so far!
(A) Initial Initial KE = 0 and V = 0 ANS (a) (B) assuming angles are measured from the vertical h1 = 4 sin 30 = 2m h2 = 4 sin 60 = 3.46 m h2 – h1 = h = 1.46 m delta V = √ 2 g (1.46) = √ 19.6 (1.46) = √ 28.6 = 5.35 m / s ANS (b) (c), delta h = 4 – 2 = 2 m V = √ 2 g (2) = 4g = √ 2 √ g = 6.26 m / s ANS (c)
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