Question

If a ring of mass 50 g and radius 2cm is rolling on a smooth horizontal platform with its centre of mass moving with a speed of 50 cms\(^{-1}\), then its total energy is

• A. \(1.0 \times 10^{-2}\) J
• B. \(1.25 \times 10^{-2}\) J
• C. \(2.5 \times 10^{-2}\) J
• D. \(3.5 \times 10^{-2}\) J
• E. \(1.5 \times 10^{-2}\) J

Hint:

For a rolling ring, the translational and rotational kinetic energies are equal.
Just calculate \(mv^2\) to get the total energy instantly.

Answer 1

The Correct Option is B