5. A 5 0 kg ball of day traveling at 10 m/s collides with a 20 kg ball of day traveling in the same direction at 2.0 m/s. What is their combined speed if the two balls stick together when they touch? a. 2.1 m/s 90 m/'s 10 m's 1. 25 m/s . 3.6 m/'s 6. A Tesla car driving along a highway road has a certain quantity of momentum. If it moves at the same speed but has twice as much mass, its momentum is a. zero b. quadrupled c. doubled d. unchanged 7. In a physics experiment, two equal-mass carts roll towards each other on a level, low-friction track. One cart rolls rightward at 2 m/s and the other cart rolls leftward at 1 m/s. After the carts collide, they attach together and roll together with a speed of . Ignore resistive forces. a. 0.5 m/s b. 0.33 m/s c. 0.67 m/s d. 1.0 m/s e. none of these 8. A 1400 kg car sliding on frictionless ice at 26 m/s hits a stationary 2400 kg minivan. The two vehicles are locked together after impact on the ice. What is their speed after impact? 0.0 m/s 15 m/s 26 m/s 9.6 m/s 16 m/s