A ball attached to a string is whirled around in a horizontal circle having a radius r. If the
radius of the circle is changed to 4r and the same centripetal force is applied by the string, the new
speed of the ball is which of the following?
1) One-quarter the original speed 2) One-half the original speed
3) The same as the original speed 4) Twice the original speed 5) Four times the original speed
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twice its orignal speed
is it correct
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