Consider two hockey pucks identical in every respect except that one is black an
ID: 1457306 • Letter: C
Question
Consider two hockey pucks identical in every respect except that one is black and the other is white. The black puck is initially at rest on the ice. A player shoots the white puck directly at the black one with velocity v white. The white puck hits the black puck elastically dead center. What is the velocity of each puck after the collision? Suppose that the positive direction is the direction of the white puck's initial velocity. Denote the magnitude of v white as v. Express your answers in terms of v separated by a comma.
Explanation / Answer
after collision
white has velocity v1 = (m1-m2)*v/(m1+m2) = 0 m/s (since m1 = m2)
black has velcity v2 = 2*m1*v/(m1+m2) = v in the direction of initial velocity of white puck