Question

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=

Answer #1

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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