A merry-go-round, having a radius of 2.5 m, is set in motion starting from rest, by students applying a force of 500 N tangential to the rim of the wheel. After five seconds of torque, the students let go and measure the rotational speed: 1.25 rad/s. The rotational inertia of the merry-go-round is
A. 5.0 × 103 kg m2.
B. 1.7 × 103 kg m2.
C. 1.0 × 104 kg m2.
D. 2.5 × 103 kg m2.
E. 7.5 × 102 kg m2.
Answer: A
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