- #1
Titan97
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Homework Statement
Homework Equations
W=-ΔU for conservative force.
The Attempt at a Solution
Let all three forces be conservative.
Since particle comes back to where it was, ΔU=0.
Hence ΔUAB+ΔUBC+ΔUCA=0
Hence WCA=-WAB-WBC
For case A, if both WAB, WBC>0, then WCA<0. Else its greater than zero. It is not possible for WCA=WBC because it will contradict the given statement. (Let WAB=WBC=x and other be equal to y. Then 2x=y and x=y which is not possible).
Hence for A: q,s.
Given answer: q,s
Moving onto case C, again q is true. But r can't be true since they have opposite signs. s can also be true.
Hence for C: q,s
Given answer: q,r,s
Are they considering only the magnitude?