Newton's laws of motion work best for objects under which conditions.

a. very slow and fast moving.
b. very large and slow moving.
c. very small and slow moving.
d. very large and fast moving.

I have no idea what "very" means, it is certainly not a physics term. I have no idea what "fast" means, does that mean near the speed of light?

Honestly, I wonder what your physics teacher was thinking when these answers were written. They hold very will with all objects, except near the speed of light.

To determine which condition Newton's laws of motion work best for, we need to understand what Newton's laws describe. Newton's laws of motion are fundamental principles that govern the motion of objects. They are applicable in various scenarios, but there are certain conditions where their effectiveness is more prominent.

Newton's laws of motion work best for objects that are in relatively low-speed and macroscopic (large-scale) motion. This means that the correct option from the given choices is option d. very large and fast moving.

However, it's important to note that Newton's laws of motion are an approximation and may not accurately describe the behavior of objects in extreme scenarios. For example, at very high speeds approaching the speed of light or when dealing with objects at a subatomic scale, the laws of motion described by Newton's laws may need to be modified by Einstein's theory of relativity or quantum mechanics, respectively.