A research drone carries a sensor package. After releasing the package, the drone accelerates.
The table gives data for the drone at two stages of its flight.
| Stage | Mass of drone and load in kg\text{kg}kg | Speed in m s−1\text{m s}^{-1}m s−1 |
|---|---|---|
| carrying the package | 6.0 | 12 |
| after releasing the package | 4.5 | 16 |
Calculate the percentage change in the kinetic energy of the drone between the two stages.
The drone then slows down without changing its mass.
Calculate the speed of the drone when its kinetic energy is equal to its kinetic energy when it was carrying the package.