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Class 11 NEET Physics Work, Energy and Power Questions
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© examsnet.com
Question : 22
Total: 89
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?
[NEET 2016 P2]
2 J
8 J
11 J
5 J
Validate
Solution:
→
S
=
→
r
f
−
→
r
i
=
(
4
^
j
+
3
^
k
)
−
(
−
2
^
i
+
5
^
j
)
=
2
^
i
−
^
j
+
3
^
k
→
F
=
4
^
i
+
3
^
j
ω
=
→
F
.
→
S
=
(
4
^
i
+
3
^
j
)
.
(
2
^
i
−
^
j
+
3
^
k
)
= 8-3 = 5J
© examsnet.com
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