In a world where everyone has an invisible bubble around them that makes them bounce off each other like bumper cars, what happens when Chika, standing still, is approached straight on by Kofi who is running at full speed? Provide a very brief response.
As Kofi reaches Chika, both of their invisible bubbles would come into contact. Given that the bubbles make them bounce off each other and Chika is stationary, the interaction would be similar to a moving bumper car hitting a stationary one. Kofi's bubble would compress upon impact and then expand, transferring the momentum to Chika's bubble. Kofi would slow down or stop, depending on the conservation of momentum principle in this magical world, while Chika would be pushed backward from the force of the impact. If the bubbles perfectly conserve momentum, Chika would start moving at the speed Kofi had been moving just before the impact, assuming their masses are similar and the bubble's magic doesn't add or remove energy from the system.