1. Two children at rest push off from each other in a swimming pool. One with a mass of 50 kg moves east at 1.5 m/s and the other who has a mass of 45 kg moves to the west. What is the second child's velocity? 2. A 1.5-kg ball moving at 2.0 m/s to the right collides head on with a 1.0-kg ball moving at 3.0 mis to the left. The coefficient of restitution is 0.70. Find the speed and direction of the balls after collision. 3. A 3.0-kg block moving to the right on a frictionless table at 4.0 m/s makes a head-on collision with another 3-kg block moving 5 m/s to the left. Find the final velocity of the blocks, if the collision is (a) perfectly elastic, and (b) perfectly inelastic.

1. Two children at rest push off from each other in a swimming pool. One with a mass of 50 kg moves east at 1.5 m/s and the other who has a mass of 45 kg moves to the west. What is the second child's velocity? 2. A 1.5-kg ball moving at 2.0 m/s to the right collides head on with a 1.0-kg ball moving at 3.0 mis to the left. The coefficient of restitution is 0.70. Find the speed and direction of the balls after collision. 3. A 3.0-kg block moving to the right on a frictionless table at 4.0 m/s makes a head-on collision with another 3-kg block moving 5 m/s to the left. Find the final velocity of the blocks, if the collision is (a) perfectly elastic, and (b) perfectly inelastic.