Amplitude of 3-kg Pendulum 2m Arc 21.4°

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SUMMARY

The discussion focuses on calculating the amplitude of a pendulum with a mass of 3 kg and a length of 2 meters, swinging through a half arc of 21.4 degrees. The amplitude is determined to be approximately 74.66 cm. The relationship between arc length, radius, and angle is highlighted, with the formula arc = radius * angle being essential for solving the problem. Additionally, the concepts of kinetic and potential energy changes are relevant for understanding the pendulum's motion.

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A pendulum has a mass of 3-kg, a length of 2 meters and swings through a (half)arc of 21.4 degrees. What is its Amplitude to the nearest centimeter ?

i don't undretand the queston; half arc? amplitude?

and how would you use kinetic/potential energy change to solve this porblem? i really don't understand this qusetion i'd really likea couple of hints and tips for this problem thanks a lot
 
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74.66 cm
arc=radius*angle
 

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