CAIE A-Level Physics A2 13.3.3 G Is Approximately Constant for Small Changes in Height Near the Earths Topic Practice

Describe qualitatively the variation, if any, with distance x of the speed of the particle as it
moves from $x=12 \mathrm{~cm}$ to $x=25 \mathrm{~cm}$
passes through $x=26 \mathrm{~cm}$
moves from $x=27 \mathrm{~cm}$ to $x=31 \mathrm{~cm}$
reaches $x=32 \mathrm{~cm}$
2. The particle has charge $3.2 \times 10^{-19} \mathrm{C}$ and mass $6.6 \times 10^{-27} \mathrm{~kg}$.

Calculate the maximum speed of the particle.
speed = $\mathrm{ms}^{-1}$

By reference to the pattern of the lines of gravitational force near to the surface of the Earth, explain why the acceleration of free fall near to the Earth's surface is approximately constant.