A 3.0-kg block (A) is attached to a 1.0-kg block (B) by a massless spring that is compressed and locked in place, as shown in the figure. The blocks slide without friction along the x-direction at an initial constant speed of v = 2.0 m/s. At time t = 0 s, the positions of blocks A and B are XA,i = 1.0 m and XB,i = 14 m respectively; at which point a mechanism releases the spring, and the blocks begin to oscillate as they slide.
If 2.0 s later block B is located at XB,f = 7.3 m, what will be the position XA,f of block A?
XA,f =