A marble rolls down an incline, starting from rest 21.2 cm above the bottom.
What's its speed when it reaches the bottom?
Express your answer with the appropriate units.
v=
Kinetic energy gained = potential energy lost
Where , I is moment of inertia of spherical ball and is the angular velocity . For rolling , , where r is the radius .
= 10×9.8×0.212/7
= 2.968
1.72 m/s
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