1. The problem statement, all variables and given/known data There is a wagon (W) on wheels with a vertical pole of 2m. (mass 20kg) On the top of that pole there is a rope pendulum with an attached mass (M) of 10kg and length 1m. The starting position is a pendulum angle of 60°. No friction taken into account. What is the speed of the mass compared to the wagon the first time it passes the pole? 2. Relevant equations Ep= m * g * h Ek= m*v²/2 3. The attempt at a solution 1. EM0= 10kg * 10 m/s² * (1m *cos60) = 50J EW0= 0 2. EM1= 10kg*VM²/2 EW1= (10kg+20kg) *VW²/2 50J=EM1+EW1 And now i don't know how to continue.