1. The problem statement, all variables and given/known data The unknowns below read as "m sub 1", "rub sub 2" etc. The maths part of a physics problem states: r1/v1 = r2/v2 Combining these with equation : m1r1 = m2r2 gives: v1/v2 = r1/r2 = m2/m1 2. Relevant equations 3. The attempt at a solution Would anyone be able to explain to me how they have gone to the final line of v1/v2 = r1/r2 = m2/m1 Thank you!