A0.30 kg mass is sliding on a horizontal, frictionless air track with a speed of 4.0 m/s when it instantaneously hits and sticks to a 2.0 kg mass initially at rest on the track. the spring constant is 100 n/m . the other end of the spring is fixed. a. determine the following for the 0.30 kg mass immediately before the impact: i. its linear momentum ii. its keb. determine the following for the combined masses immediately after the impact: i. the linear momentum in. the kec. besides the fact that the objects stick together, what other clue lets you know that this was an inelastic collision