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Tardigrade
Question
Physics
A particle moves from a point (-2 hati + 5 hatj) to ( 4 hatj + 3 hatk) when a force of (4 hati + 3 hatj ) N is applied. How much work has been done by the force ?
Q. A particle moves from a point
(
−
2
i
^
+
5
j
^
)
to
(
4
j
^
+
3
k
^
)
when a force of
(
4
i
^
+
3
j
^
)
N
is applied. How much work has been done by the force ?
8585
218
NEET
NEET 2016
Work, Energy and Power
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A
8 J
10%
B
11 J
20%
C
5 J
65%
D
2 J
4%
Solution:
W
=
F
.
d
S
=
(
4
i
^
+
3
j
^
)
.
[(
4
j
^
+
3
k
^
)
−
(
−
2
i
^
+
5
j
^
)]
=
(
4
i
^
+
3
j
^
)
.
(
2
i
^
−
j
^
+
3
k
^
)
=
8
−
3
=
5
J