Question

You throw a bouncy rubber ball and a wet lump of clay, both of mass m, at a wall. both strike the wall at speed v, but while the ball bounces off with no loss of speed, the clay sticks. what is the change in momentum of the clay and ball, respectively

Answer 1

Change of momentum for the ball equals 0, since its speed did not change. To calculate the change a momentum of a wet lump of clay, more information is needed. We need to know the mass of the lump of clay and the speed at which it has hit the wall.