I am acceleration.
I am a barycenter.
I am 299,792,458 meters per second ( c ).
I am distance.
I am energy.
I am force.
I am -9.81 meters per second per second ( g ).
I am height.
I am the square root of -1 ( i ).
I am a Joule of work.
I am kinetic energy.
I am length.
I am density times volume (mass, m ).
I am some number ( n ).
I am open in my geometry.
I am momentum ( p ).
I am a quark.
I am a radius.
I am displacement ( s ).
I am time.
I am potential energy ( U ).
I am velocity.
I am an X-ray.
I am young.
I am redshift ( z ).