A car of mass 1750 kg moving at 20 m/s to the north, rearends a truck of mass 7000 kg that is moving in the same direction at 5 m/s. The vehicles stick together after the impact. What is the velocity of the wreck after the collision?

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.