An electric vehicle's battery pack has a usable energy capacity of 85 kW h. What is the decrease in the mass of the battery pack when it is completely discharged from full to empty?
9.4×10−16 kg9.4 \times 10^{-16}\text{ kg}9.4×10−16 kg
5.7×10−11 kg5.7 \times 10^{-11}\text{ kg}5.7×10−11 kg
3.4×10−9 kg3.4 \times 10^{-9}\text{ kg}3.4×10−9 kg
1.0 kg1.0\text{ kg}1.0 kg
