Which row in the table describes the speed and potential energy of a particle at point P on this path? | Speed at P | Potential energy at P | |------------|-----------------------| | A | greatest | | B | greatest | | C | least | | D | least | - Edexcel - A-Level Physics - Question 8 - 2023 - Paper 1

To determine the correct row, we need to consider the principles of energy conservation in a particle's motion. As a particle moves in a field, its speed and potential energy are inversely related. When the potential energy is at its maximum, the kinetic energy (and thus speed) is at its minimum, and vice versa.

At point P, if we expect potential energy to be greatest, we would conclude from the conservation of energy that the speed of the particle would be least in that case. Conversely, if the particle has the least potential energy at point P, it can achieve the greatest speed.

Therefore, the correct answer from the table is:

• Row C: Speed at P is least, and Potential energy at P is greatest.