A figure skater on ice with arms extended, spins at a rate of 2.5 rev/s. After he draws his arms in, he spins at 6.0 rev/s. By what factor does the skater's kinetic energy change when he draws his arms in?
A.
2.4
B.
1.0
C.
0.42
D.
0.12
E.
0.012
F.
0.18
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【单选题】By the year 2010, Mr Carp hopes for digital income to account for 70% of his company.