A i think because it’s talking about covering ground, a faster car would cover more ground.
Potential energy is the energy stored in matter because of
its position or because of the arrangement of parts.
Displacement is known as the net movement of an object with respect to its original position. One may travel out of his city and return. Despite having covered many miles, he will have have a displacement of 0.
This is true for all paths that have zero displacement, that they all return to their original position.
Your question is missing one part as "magnification"
i have completed the missing part below
Answer:
a. 
b. 
Explanation:
For this type of numerical we will use the following formulas
......... Eq1
where,
refractive index of the medium surrounding refracting surface/object
i.e. =
refractive index of the refracting surface/object
i.e. 
distance of object from the vertex of the refracting surface
distance of image from the vertex of the refracting surface
radius of curvature of the refracting surface
........... Eq2
where,
magnification
Convention:
Given:
=
because refraction surface is concave
Required:
a. 
b. 
Solution:
a. putting values in eq1, we get
cm
b. 
