Calculate the speed of the particle

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The discussion focuses on calculating the speed of a particle in a simple pendulum system with a string length of 2.70 m and an initial angle of 30.5°. Participants suggest using conservation of energy principles, specifically gravitational potential energy and kinetic energy, to determine the particle's speed at various positions. The correct approach involves calculating the speed at the lowest point of the trajectory and at an angle of 15.0° using these energy concepts. The mention of air friction and hypothetical conditions emphasizes the idealized nature of the problem.

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A simple pendulum, consists of an object suspended by a string. The object is assumed to be a particle. The string, with its top end fixed, has negligible mass and does not stretch. In the absence of air friction, the system oscillates by swinging back and forth in a vertical plane. If the string is 2.70 m long and makes an initial angle of 30.5° with the vertical, calculate the speed of the particle at the following positions.

(a) at the lowest point in its trajectory

(b) when the angle is 15.0°


I thought I could use ac = V^2/r.. but I got the wrong answers
anyone have any hints for me on what I use for formulas?
 
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Try conservation of energy (gravitational potential energy and kinetic energy). Take the bottom position as your reference point.
 
In free space, umm it doesn't.

You have a hypothetical string of no mass in with a hypothetical end point. Are we to assume it is in a hypothetical Earth gravity or some other space?
 

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