11. When a force vector F = (i+2j+k) N acts on a body and produces displacement of 5 =(4ỉ +j+TÈM
then the work done is
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Work =
F
.
S
=(
i
^
+2
j
^
+
k
^
)⋅(4
i
^
+
j
^
+
7
^
k
^
)
=4+2+7
=13 J
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