A pool ball initially moves at a constant speed of 4.00 m/s on a horizontal pool table. Another pool ball is initially at rest. The two balls collide. Friction and air resistance can be ignored, and the collision is perfectly elastic. The masses of the two pool balls are 0.2 kg each. Select all of the following final speeds that are possible for the two pool balls.

A pool ball initially moves at a constant speed of 4.00 m/s on a horizontal pool table. Another pool ball is initially at rest. The two balls collide. Friction and air resistance can be ignored, and the collision is perfectly elastic. The masses of the two pool balls are 0.2 kg each. Select all of the following final speeds that are possible for the two pool balls.