Help. The answers I got don't make any sense.

Energy transferred to a recoil is given by T = = AE(1 - cose) where O is the scattering 4mim2 angle in the CM system and 1 = (m,+m,)2. Consider special case of head-on collision, and compare TMax and E for the following cases: a) m1~mz b) m1 > > mz c) m1