julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. she…

julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. she places a single mark on the sidewalk next to the snail. what will julie use the mark for initially? determining how fast the snail moves acting as a standard unit of measure determining the displacement of the snail acting as a reference point for detecting motion

julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. she places a single mark on the sidewalk next to the snail. what will julie use the mark for initially? determining how fast the snail moves acting as a standard unit of measure determining the displacement of the snail acting as a reference point for detecting motion

Answer

Brief Explanations:

Julie wants to know if the snail moves. A reference point helps in detecting motion. By marking a spot next to the snail, she can see if the snail's position relative to that mark changes. It's not for determining speed (no time - distance relation here), not a standard unit of measure, and displacement requires more than just a starting mark.

Answer:

D. acting as a reference point for detecting motion