Extra Energy Used for Work (\( E \)):

\[ E = A \cdot F \cdot M + B \cdot F \cdot L + \frac{W}{C} + \frac{9.81 \cdot H \cdot M}{D} \]

Where:

• \( E \) is the extra energy used for work, in kilojoules (kJ).
• \( A \) is the energy used to move 1 kg of body weight 1 m horizontally, in joules (J).
• \( F \) is the distance travelled, in kilometers (km).
• \( M \) is the liveweight, in kilograms (kg).
• \( L \) is the load carried, in kilograms (kg).
• \( B \) is the energy used to move 1 kg of applied load 1 m horizontally, in joules (J).
• \( W \) is the work done in pulling load, in kilojoules (kJ).
• \( C \) is the efficiency of doing mechanical work, as a decimal.
• \( H \) is the distance moved vertically upwards, in kilometers (km).
• \( D \) is the efficiency of raising body weight, as a decimal.