Students test a small probe of mass 0.20 kg using a launch rail. Once the probe leaves the rail it has no motor and travels straight up. A data logger on the probe records its speed and its height above the ground at two points, A and B, while it is still rising. Use g=10 N kg−1g=10\ \text{N kg}^{-1}g=10 N kg−1.
| Point | Speed (m s−1\text{m s}^{-1}m s−1) | Height (m) |
|---|---|---|
| A | 10 | 1.0 |
| B | 6.0 | 4.2 |
Calculate the decrease in the probe's kinetic energy and the increase in its gravitational potential energy between points A and B.
Explain whether these results are consistent with air resistance on the probe being negligible.