Final answer:
Using the conservation of momentum, the final velocity of Car 2, when struck by Car 1 and both having equal masses, would be 1.15 m/s.
Step-by-step explanation:
When Car 1 with a mass of 9.4 kg and moving at a velocity of 2.3 m/s collides with stationary Car 2 also with a mass of 9.4 kg, we can determine the final velocity of Car 2 using the principle of conservation of momentum, provided no external forces are involved. The total momentum before the collision must equal the total momentum after the collision because momentum is conserved. We have Initial total momentum = momentum of Car 1 + momentum of Car 2 (which is zero since it's stationary). Final total momentum = momentum of both cars after the collision. So, (9.4 kg × 2.3 m/s) + (9.4 kg × 0 m/s) = (9.4 kg + 9.4 kg) × final velocity of Car 2. After simplifying, the final velocity of Car 2 is 1.15 m/s (having the same mass and moving together after the collision).