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**1. Homework Statement**

A particle moves along a circular path over a horizontal xy plane at a constant speed. At time t1= 3.00s, its acceleration vector is given by (3i-5j) m/s^2. At time t2=7.00 s, its acceleration is given by (-3i+5j) m/s^2.

Find the radius of the particle's circular path.

**2. Homework Equations**

centripetal acceleration = v^2/r

**3. The Attempt at a Solution**

Stumbling around for about an hour with no clue what to do... left me with nothing to show for.