Two gliders with the initial velocities and masses shown below hit each other in a perfectly elastic collision (elasticity 1.0). What will be the velocity of glider 2 after the collision 0.0 ms 2.0 ms?

After the collision, the velocities of the two gliders will swap, so glider 2 will have a velocity of 0.0 m/s. This is because the two gliders have the same mass, so they will exchange velocities in the collision.