You have not fully defined the problem. How fast are they travelling before they collide? Where to they go after that? Why should they "land" anywhere? Do they fall of a cliff? Is there any friction?
It would be unusual for mables to stick together
If two marbles having mass of 27.7 grams and of 3.6 grams have stuck together where do they land and how much kinetic energy would be lost ?
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