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Physics
Physics
Problem
Which one of the following expressions correctly gives the displacement vector
Δ
r
\Delta \mathbf r
Δ
r
of a particle that moves from position vector
r
1
\mathbf r_1
r
1
to position vector
r
2
\mathbf r_2
r
2
? a)
r
1
−
r
2
\mathbf r_1-\mathbf r_2
r
1
−
r
2
b)
2
(
r
2
−
r
1
)
2\,(\mathbf r_2-\mathbf r_1)
2
(
r
2
−
r
1
)
c)
r
2
−
r
1
\mathbf r_2-\mathbf r_1
r
2
−
r
1
d)
r
1
+
r
2
\mathbf r_1+\mathbf r_2
r
1
+
r
2
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