Rotational Kinetic Energy: A solid uniform disk is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal. What is the speed of the disk after it has rolled 3.0 m up as measured along the surface of the ramp?
A. 4.0 m/s
B. 1.9 m/s
C. 2.1 m/s
D. 6.8 m/s
E. 8.0 m/s
Answer: B
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