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## Homework Statement

The centripetal force acting on an object is doubled. The radius is also doubled. The speed of the object:

(a) increases by a factor of 4

(b) increases by a factor of 2

(c) decreases by a factor of 2

(d) The change in the object's speed depends on its mass

## Homework Equations

F = mv

^{2}/r

## The Attempt at a Solution

So if I substitute 2's in for F and r in the above equation, my 2's cancel but the correct answer is a. ???