Useful Equations: Kinetic energy: KE = = mv2 Potential Energy: PE = mgy Momentum: p = mv Torque: T = r F Sin(0) Work: W = F d Cos(0) Impulse = FAt = mvf - mvi FG = mg g = 9.8 m/s2 When two kids (masses 18 kg and 27 kg respectively) sit on the two ends of a 5 m long seesaw, it is not balanced. Where should a third kid (mass 16Kg) sit on the seesaw to balance it? glee calculation this time