workdone = dPE + dKE + dQ
-720 = - 640 + dKE + 180
dKE = - 260 J
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10.38
using energy conservation
1 + 1 + 4 = k1 + 3 + 1
k1 = 2 J
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please help with both! thank you :) Review A system loses 640 J of potential energy....
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