What is the SI unit of momentum? --> N x s When a light beach ball rolling with a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, approximately? --> 6.0 m/s In an inelastic collision, if momentum is conserved, then which of the following statements is true about kinetic energy? --> Kinetic energy is lost. Which of the following is an accurate statement? The momentum of a projectile is constant. <--- The momentum of a moving object is constant. If an object is acted on by a non-zero net external force, its momentum will not remain constant. If the kinetic energy of an object is doubled, its momentum will also be doubled. A 4.0 N force acts for 3.0 s on an object. The force suddenly increases to 15N and acts for one more second. What impulse was imparted by these forces on the object? --> 16.3 N·s Thanks!