1. The problem statement, all variables and given/known data A 26.2 kg child rides a 1.00 kg potato sack down a 2.05 m high slide. If the child starts from rest and has a speed of 1.60 m/s at the bottom of the slide, what is the change in thermal energy of the child on their potato sack and the slide? 2. Relevant equations KE = (1/2)mv2 PE = mgh 3. The attempt at a solution PE = KE + Eth mgh = (1/2)mv2+Eth (27.2 kg)*(9.8 m/s2)*(2.05 m) = (1/2)*(27.2 kg)*(1.60 m/s)+Eth Eth= 511.632 J Was I supposed to add the mass of the child and potato sack together? Also was my answer, 511.632 J, correct or is there more I have to do to find the change in thermal energy? or is this whole approach wrong?