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System of Particles and Rotational Motion
  1. A spherical ball rolls on a table without slipping. Then the fraction of its total energy associated  with rotation is
    1. 2/5
    2. 2/7
    3. 3/5
    4. 3/7
Correct Option: B

=
1
MK²ω²
Kr2
E
1
Mω²[K² + R²]
y²

=
K²
K² + R²

=
2/5
 =
2
1 + 2/57

Here, K² =
2
R²
5


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