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Byju's Answer
Standard XII
Physics
Displacement
An object is ...
Question
An object is displaced from position vector
→
r
1
=
(
2
^
i
+
3
^
j
)
m
to
→
r
2
=
(
4
^
i
+
6
^
j
)
m
under a force
F
=
(
3
x
2
^
i
+
2
y
^
j
)
N
. Find the work done in joules by this force.
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Solution
W
=
∫
r
2
r
1
F
.
d
r
=
∫
r
2
r
1
(
3
x
2
^
i
+
2
y
^
j
)
.
(
d
x
^
i
+
d
y
^
j
+
d
z
^
k
)
=
∫
r
2
r
1
(
3
x
2
d
x
+
2
y
d
y
)
=
[
x
3
+
y
2
]
(
4
,
6
)
(
2
,
3
)
=
83
J
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^
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)
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