A 20-Kg Mass Swings at the End of a Light String

question 53

Multiple Choice

A 2.0-kg mass swings at the end of a light string (length = 3.0 m) . Its speed at the lowest point on its circular path is 6.0 m/s. What is its kinetic energy at an instant when the string makes an angle of 50° with the vertical?

• A) 21 J
• B) 15 J
• C) 28 J
• D) 36 J
• E) 23 J

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