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Byju's Answer
Standard XII
Physics
Floating
What is the k...
Question
What is the kinetic energy of the disc?
A
12
J
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B
8
J
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C
20
J
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D
10
J
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Solution
The correct option is
A
12
J
Given:
m
=
1
k
g
r
=
20
c
m
a
=
20
c
m
−
2
v
=
4
m
/
s
A
C
=
B
C
=
10
c
m
Total K.E=translational K.E+Rotational K.E
K
E
=
1
2
m
v
2
+
1
2
I
ω
2
=
1
×
4
2
2
+
1
2
×
(
1
2
×
1
×
.2
2
)
(
4
.2
)
2
=
12
J
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