car b is rounding the curve with a constant speed of 54 km/h, and car a is approaching car b in the intersection with a constant speed of 72 km/h. determine the velocity which car a appears to have to an observer riding in and turning with car b. the x-y axes are attached to car b. is this apparent velocity the negative of the velocity which b appears to have to a non-rotating observer in car a? the distance separating the two cars at the instant depicted is 40 m.