A 1200-kilogram car moving at 12 meters per second collides with a 2300-kilogram car that is waiting at rest at a traffic light. After the collision, the cars lock together and slide. Eventually, the combined cars are brought to
rest by a force of kinetic friction as the rubber tires slide across the dry, level, asphalt road surface. Calculate the
magnitude of the frictional force that brings the locked-together cars to rest. [Show all work,
including the equation and substitution with units.] Hint: the two cars are locked together, so add their masses,
also calculate the acceleration first.]