A box is 0.6 meters long and 0.2 meters wide and 0.5 meters tall. If the radius of a ping pong ball is .019 meters, about how many ping pong balls will it take to fill up the box? The volume of a sphere is 4pr3/3.

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?