Elastic 2-D Collisions without given masses?

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In the discussion about elastic 2-D collisions involving curling stones, the main focus is on calculating the velocity of a shot stone after colliding with a stationary stone. Participants express confusion over how to solve the problem without knowing the masses of the stones, as the results can vary significantly based on mass differences. However, it is noted that in classic curling shots, the stones typically have the same mass, which simplifies the calculations. The conversation emphasizes the importance of this assumption in applying the relevant equations for elastic collisions. Ultimately, understanding that the masses are equal allows for a straightforward solution to the problem.
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Homework Statement


In a classic curing shot, the shot stone, traveling at 6.0m/s [E] hits a stationary stone. The target stone is propelled at a velocity of 2.0 m/s [East30degreesSouth] What is the velocity of the shot stone after the collision? (Assume the collision is fully elastic)

Homework Equations


V11 =((ΔmΔV)/ MT) + V2
V21 = ((-2*M1*ΔV) / MT) + V2

The Attempt at a Solution


I don't know how to figure out this question without a mass
Do I go through the solution and just sub in a value for m? The problem is that the result will be different if the curling stones have different masses...
 
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Since the masses of the stones are the same, I would think it would cancel out.
 
Thats just it, it doesn't say they are the same. It doesn't specify what the mass is of either of the stones..
 
"a classic curing shot" so its the same mass.
 
Oh, I didn't realize that in a classic curling shot, they have the same mass... We've done examples in class where the rocks have the same mass, and some have different...
Thanks for your help everyone :)
 
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