Abilliard ball rolling across a table to the right at 1.8 m/s makes a head-on elastic collision with an identical ball. the mass of a billiard ball is 38 q if the second ball initially at rest, what is the velocity of the first ball after the collision? tries 0/20 submit answer initially at rest, what is the velocity of the second ball after the collision? if the second ball submit answer tries 0/20 if the second ball is initially moving to the left with a velocity of -0.9 m/s, what is the velocity of the first ball after the collision? tries 0/20 submit answer if the second ball is initially moving to the left with a velocity of -0.9 m/s, what is the velocity of the second ball after the collision?