The gravitational force between the spheres is
where <em>G</em> = 6.674 x 10⁻¹¹ N m²/kg².
The weight of the lighter sphere is
where <em>g</em> = 9.80 m/s².
The ratio between the two forces is then
The clouds that occur at the highest altitude are usually
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The kinetic energy of an object of mass m moving with speed v is given by:
For the bicycle in our problem,
and 
, so the kinetic energy is
For the bicycle in our problem,