a) Two air-track gliders of equal mass are initially moving in the same direction along a straight line. The rearmost glider has an initial speed of 4.7 m/s and the forward glider has a speed of 1.5 m/s. The collision is elastic.
What is the speed of the first glider (rearmost) after the collision?
b) What is the speed of the second glider (forward)?