Elastic 2-D Collisions without given masses?

[kelseymclean]

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)/ M_T) + V₂
V₂¹ = ((-2*M1*ΔV) / M_T) + 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...

 

[hage567]

Since the masses of the stones are the same, I would think it would cancel out.

 

[kelseymclean]

Thats just it, it doesn't say they are the same. It doesn't specify what the mass is of either of the stones..

 

[glueball8]

"a classic curing shot" so its the same mass.

 

[tiny-tim]

The problem is that the result will be different if the curling stones have different masses...

Hi kelseymclean!

Does this help? http://en.wikipedia.org/wiki/Curling#Curling_stone_.28rock.29

 

[kelseymclean]

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 :)