A train made up of a locomotive and two cars of mass m each moves on two horizontal rectilinear rails under the action of force of traction f developed by the locomotive

answer; ///(u-235); ///is the correct

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

the answer is d. 74.02

you didnt put any of the following