A Hoop with a Mass of 2 $25 ^ { \circ }$

question 120

Multiple Choice

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 2 $25 ^ { \circ }$ 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?

• A) 22 J
• B) 34 J
• C) 45 J
• D) 62 J
• E) This question cannot be answered without knowing the radius of the hoop.

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