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JEEMAIN-2014
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Q)
When a rubber-band is stretched by a distance
x
, it exerts a restoring force of magnitude
F
=
a
x
+
b
x
2
where
a
and
b
are constants. The work done in stretching the unstretched rubber-band by
L
is :
(
A
)
a
L
2
2
+
b
L
3
3
(
B
)
1
2
(
a
L
2
2
+
b
L
3
3
)
(
C
)
a
L
2
+
b
L
3
(
D
)
1
2
(
a
L
2
+
b
L
3
)
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