A toy freight train consists of an engine and three identical cars. The train is moving to the right atconstant speed along a straight, level track. Three spring scales are

used to connect the cars as follows:spring scale A is located between the engine and the first car; scale B is between the first and secondcars; scale C is between the second and third cars. Ignore the weights of the scales. If air resistance and friction are negligible, the relative readings on the three spring scales A, B, andC are the same. What are the relative readings of scales A, B, and C?