Initially, a Small 2

question 58

Multiple Choice

Initially, a small 2.0-kg rock is whirling at the end of a very thin string in a circular path of radius 0.75 m on a horizontal frictionless surface, as shown in the figure. The initial tangential speed of the rock was 5.0 m/s. The string has been slowly winding around a vertical rod, and a few seconds later the length of the string has shortened to 0.25 m. What is the instantaneous speed of the mass at the moment the string reaches a length of 0.25 m?

• A)3.9 m/s
• B)9.3 m/s
• C)15 m/s
• D)225 m/s
• E)75 m/s

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