21. A hoop with a mass of 2.75 kg is rolling without slipping along a...

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21. A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts down a ramp that makes an angle of 25 below the horizontal. What is the rotational kinetic energy of the hoop after it has rolled 3.0 m down as measured along the surface of the ramp?O 62 JO 34 JO This question cannot be answered without knowing the radius of the hoop.O 45 JO 22 J

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