1. During a thunderstorm, 1900kg car slides at a speed of 5.00m/s into a 1300kg car stopped at a red light. Upon the collision the cars lock together an the combined masses slides into the intersection. The kinetic energy of the combined mass after the collision and the type of collision are:A.2.38 x10^4 J and inelastic B 2.38 x10^4 J and elastic C 1.41 x10^4 J and elastic D 1.41 x10^4 J and inelastic

Physics 30 students were Investigating different methods of charging. They made the following observations: A) Grounding is required to complete this method of charging. B) Rubbing an ebonite rod with fur results in electrons being transferred from the fur to the rod. C) A neutral electroscope becomes negatively charged when the top is touched with a negatively charged object. D) If a system contains + 4 C of charge and -6 C of charge, the net charge of the system is -2 C. Methods of Charging Physics Principles *(The same principle may be used more than once). 1. Conduction 5. Conservation of energy Friction 6. Conservation of mass-energy nduction 7. Conservation of charge 4. All of the above 8. Conservation of nucleons Select the method of charging and the physics principle that explains the observation. Observation Method of Charging Physics Principle A B C D