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JEE Main Physics Class 11 Work, Energy and Power Part 2 Questions
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© examsnet.com
Question : 30
Total: 100
A solid sphere of mass
1
kg
rolls without slipping on a plane surface. Its kinetic energy is
7
×
10
−
3
J
. The speed of the centre of mass of the sphere is _______
cm
s
−
1
.
[31-Jan-2023 Shift 1]
Your Answer:
Validate
Solution:
1
2
m
v
2
+
1
2
I
2
=
7
×
10
−
3
1
2
m
v
2
+
1
2
(
2
5
MR
2
)
(
V
R
)
2
=
7
×
10
−
3
1
2
MV
2
[
1
+
2
5
]
=
7
×
10
−
3
1
2
(
1
)
(
V
2
)
(
7
5
)
=
7
×
10
−
3
V
2
=
10
−
2
V
=
10
−
1
=
0.1
m
∕
s
=
10
cm
∕
s
Ans:
10
© examsnet.com
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