Final answer:
The reference point for the man’s motion is his house, which is the starting point for measuring his movements. He walks 30 m west and then 5 m east, and his final position can be calculated in relation to this reference point. Understanding motion relative to a reference point helps clarify his overall displacement.
Explanation:
Reference Point in Motion
The reference point for the man's motion is his starting position, which is his house. This point serves as a fixed location from which he measures his movement to the west and then to the east.
In physics, motion is often described in relation to a reference point. For example, if the man walks 30 m to the west and then 5 m to the east, he is initially moving away from his reference point (the house), but his final position can be determined by measuring from that same point.
To further illustrate, think of the man's house as the origin point on a number line. His movement to the west could be represented as a negative direction, while moving to the east can be thought of as a positive direction. So, moving 30 m west would be -30 m and moving 5 m east would be +5 m, resulting in a net position of -25 m relative to his house.
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