Two toy cars (left(m_{1}=0.200 mathrm{~kg} ight.) and (left.m_{2}=0.250 mathrm{~kg} ight)) are held together rear to rear with

Two toy cars \(\left(m_{1}=0.200 \mathrm{~kg}\right.\) and \(\left.m_{2}=0.250 \mathrm{~kg}\right)\) are held together rear to rear with a compressed spring between them. When they are released, the cars are free to roll away from the ends of the spring. If you measure the acceleration of the \(0.200-\mathrm{kg}\) car to be \(2.25 \mathrm{~m} / \mathrm{s}^{2}\) to the right while the spring is expanding, at that moment, what is the acceleration of the other car?