6. The change in an object's momentum is equal to a. the product of the mass of the object and the time interval. b. the product of the force applied to the object and the time interval. c. the time interval divided by the net external force. d. the net external force divided by the time interval. 7. Which of the following situations is an example of a significant change in momentum? a. A tennis ball is hit into a net. b. A helium-filled balloon rises upward into the sky. c. An airplane flies into some scattered white clouds. d. A bicyclist rides over a leaf on the pavement. 8. A ball with a momentum of 4.0 kgem/s hits a wall and bounces straight back without losing any kinetic energy. What is the change in the ball's momentum? a. -8.0 kgem/s c. 0.0 kgem/s b. -4.0 kgem/s d. 8.0 kgem/'s 9. The impulse experienced by a body is equivalent to the body's change in