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Test Index
JEE Main Physics Class 11 Work, Energy and Power Part 1 Questions
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© examsnet.com
Question : 11
Total: 100
A particle moves in one dimension from rest under the influence of a force that varies with the distance travelled by the particle as shown in the figure. The kinetic energy of the particle after it has travelled
3
m
is :
[7 Jan. 2020 II]
4
J
2.5
J
6.5
J
5
J
Validate
Solution:
We know area under F-x graph gives the work done by the body
∴
W
=
1
2
×
(
3
+
2
)
×
(
3
−
2
)
+
2
×
2
=
2.5
+
4
=
6.5
J
Using work energy theorem,
Δ
K
.
E
=
work done
∴
Δ
K
.
E
=
6.5
J
© examsnet.com
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