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Physics
Physics
Problem
Find the correct relation between the initial position vector
r
1
\mathbf r_1
r
1
, final position vector
r
2
\mathbf r_2
r
2
and the displacement vector
Δ
r
\Delta \mathbf r
Δ
r
. a)
Δ
r
=
r
1
−
r
2
\Delta \mathbf r = \mathbf r_1 - \mathbf r_2
Δ
r
=
r
1
−
r
2
b)
Δ
r
=
r
1
+
r
2
2
\Delta \mathbf r = \dfrac{\mathbf r_1 + \mathbf r_2}{2}
Δ
r
=
2
r
1
+
r
2
c)
Δ
r
=
r
2
−
r
1
\Delta \mathbf r = \mathbf r_2 - \mathbf r_1
Δ
r
=
r
2
−
r
1
d)
Δ
r
=
r
1
+
r
2
\Delta \mathbf r = \mathbf r_1 + \mathbf r_2
Δ
r
=
r
1
+
r
2
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