1. The problem statement, all variables and given/known data Two skaters collide and grab onto each other on frictionless ice. one of them of mass "m1" is moving to the right at "v1", while the other, of mass "m2", is moving to left at "v2" given m1, m2, v1, v2, determine: the magnitude and direction of the velocity just after the collision the loss in kinetic energy of the system 2. Relevant equations p=mv 3. The attempt at a solution m1*v1 - m2*v2 = (m1+m2)v3 v3 = (m1*v1-m2*v2) / (m1+m2) firstly I should know if that was right.. then: 1/2*m1*v1^2 + 1/2*m2*v2^2 = 1/2(m1+m2)(v3)^2 m1*v1^2 + m2*v2^2 = (m1+m2)(m1*v1-m2*v2)^2 /(m1+m2)^2 m1*v1^2 + m2*v2^2 = (m1*v1-m2*v2)^2 /(m1+m2) (m1*v1^2 + m2*v2^2) (m1+m2) = (m1*v1-m2*v2) (m1*v1-m2*v2) m1^2*v1^2 + m1*m2*v1^2 + m1*m2*v2^2 + m2*v2^2 = m1^2*v1^2 - 2*m1*m2*v1*v2 + m2^2*v2^2 m1*m2*v1^2 + m1*m2*v2^2 = -2*m1*m2*v1*v2 v1^2 + v2^2 = -2*m1*m2*v1*v2 / ( m1*m2) 2*v1*v2 + v1^2 - v2^2 theres a chance I have a clue I knew what I'm doing on the first part.. the second part clearly not?