Q5. m 3. A 1.00 kg mass and a 2.00 kg mass move on a 1-D frictionless track on which there is also a horizontal spring with force constant k = 750.0 The 1.00 kg mass moves toward the other mass (which is at rest) with a speed of 4.00. The masses collide and afterwards the 2.00-kg mass moves to the right at a speed of 2.20. a) Find the velocity of the 1.00-kg mass after the colli- sion. 4.00 m/s 1.00 kg V 1.00 kg 2.00 kg 2.20 m/s 2.00 kg k = 750 N/m marmaro for your or b) The 2.00-kg mass is then brought to a halt by the spring. By how much is the spring compressed?