in an atomic physics experiment, two atoms collide with each other in such a way

Question

in an atomic physics experiment, two atoms collide with each other in such a way that the initial total momentum of the atoms is zero. The atoms are chosen so that M2=3M1.

In a collision, the atom M1 has a final velocity V1f=-1/2(V1i). What is the realation between the final kinetic energy and the initial kinetic energy of the system (the two atoms)?

a) KEf=KEi
b) KEf=1/2KEi
c) KEf=1/2KEi
d) KEf=1/4KEi
e) KEf=1/6KEi
f) KEf=1/9KEi
g) KEf=1/sqrt(2) KEi
h) KEf= 1/sqrt(3) KEi
i) KEf=1/sqrt(6) KEi
j) KEi=0

Explanation / Answer

f

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