A blue puck with mass 0.0400 kg, sliding with a velocity of magnitude 0.200 m/s on a frictionless, horizontal air table, makes a perfectly elastic, head-on collision with a red puck with mass ?m? initially at rest. After the Collision, the velocity of the blue puck is 0.050 m/s in the same direction as its initial velocity. Find (a) the velocity (magnitude and direction) of the red puck after the collision and (b) the mass ?m? of the red puck.

Solution 96P Given that, the collision is perfectly elastic. Therefore, the coefficient of restitution is 1. Relative velocity after collision The mathematical relation of coefficient of restitution is e = Relative velocity before collision Given that, initial velocity of blue puck v = 0b200 m/s Initial velocity of red puck v = r Final velocity of blue puck v = 0.050 m/s fb Let v be the final velocity of the red puck. Relative velocity before collision = 0.200 m/s 0 = 0.200 m/s Relative velocity after collision...