Blocks a and b of unknown masses m1 and m2, respectively, are set up on an inclined plane as shown. Block a is attached to block b by a light string that passes over an ideal pulley. Block a is on a surface of negligible friction. The blocks are released from rest, block a accelerates up the incline, and its acceleration a is measured. Which of the following uses the data for the magnitude of the acceleration to support a correct claim about the masses of the blocks?.