SOMEONE ASKED 👇
MASTERING PHYSICS PROBLEM HELP PLEASE!!?
HERE THE ANSWERS 👇

The force is given by F = dU/dx (i.e. the negative of the graph’s gradient); dU/dx is sometimes called the potential gradient.
Remember to use SI units (metres for distance) when finding gradient:
When x=5cm, dU/dx = (020)/(0.100) = 200 J/m
F = (200) = 200N
The question asks for 2 significant figures so strictly speaking we should write 2.0×10²N.
When x=15cm, dU/dx = 0 so F = 0 (or maybe you need to write 0.0N).
When x=25cm AND when x=35cm, dU/dx = (20 – 0)/(0.40.2) = 100 J/m
F = 100N (negative sign means force acts in the x direction)
The question asks for 2 significant figures so strictly speaking we should write 1.0×10²N
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