A planetary lander test model is released from a research gantry. It descends, impacts a thick compressible landing pad on the surface, and rebounds. Figure 1 shows the velocity-time graph for the lander model from the moment of release until it reaches the peak of its first rebound. Air resistance is negligible.
Describe the motion of the lander model between points P and Q on Figure 1.
What direction is the lander model moving between points R and S on Figure 1?
The lander model and the planet form a system. What is meant by 'a system'? Select one option:
- A single object moving at a constant speed.
- A force field acting in a medium.
- A group of objects that interact.
When the lander model hits the landing pad, energy is transferred. Explain how the data in Figure 1 shows that energy is transferred from the lander model to the surroundings during the impact.