A mountain railway carriage of mass 10 000 kg10\,000\ \mathrm{kg}10000 kg travels from point P to point Q. Use g=10 N/kgg=10\ \mathrm{N/kg}g=10 N/kg.
| Point | Vertical height above sea level in m\mathrm{m}m | Speed in m/s\mathrm{m/s}m/s |
|---|---|---|
| P | 540 | 20.0 |
| Q | 340 | 10.0 |
Calculate the total decrease in energy in the kinetic and gravitational stores of the carriage as it travels from P to Q.