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Force Change on Spring Graph
The student measured the compression of the spring for different masses. Figure 4 shows the results.
Determine the value Δy on Figure 4.
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Marking points
- 1 Determines Δy as 250 N from the marked graph interval.
Full-mark answer
Δy = 330 N − 80 N = 250 N.
Why this answer loses marks
I copied the upper endpoint from the graph.
The marked change is the difference between both vertical endpoints, not either coordinate by itself.