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seen Jul 22 at 14:12

Feb
1
comment Why is acceleration expressed as m/s/s?
@lzkata: Momentum is as real as distance. If you want to get really precise, you never measure anything directly. Distance is measured in meters in the SI system, and one meter is defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second." There's no quality which makes distance more solid then momentum.
Jan
31
comment Why is acceleration expressed as m/s/s?
This speed and acceleration stuff isn't real what do you mean it's not real?! Momentum (mass times velocity) is a very real quantity. A bullet in front of your face standing still is very different to a bullet in front of your face approaching you at hundreds of meters per second. Momentum is as real as the physical position!