4. A block of mass \(m_1 = 1.60\) kg is moving to the right with a speed of 4.00 m/s on a frictionless horizontal track, collides with a mass-less spring attached to a second block of mass \(m_2 = 2.10\) kg, moving to the left with a speed of 2.50 m/s on the same track. Determine the maximum distance by which the spring is compressed during the collision. (4) m. (The spring has a spring constant of 600 N/m)