what has more potential energy, a skateboarder on top of the a 20-foot ramp, for a skateboarder on top of a 5 foot ramp ?
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The relativistic formula for the momentum of a particle of mass m and moving at speed v is
where c is the speed of light.
In our problem, the speed in terms of c is
, and the mass (still written in terms of c) is 
. Substituting these values in the previous formula, we can find the value of the momentum of the proton:
where c is the speed of light.
In our problem, the speed in terms of c is