BlueSky-

Here's another scenario.

Let's say I'm riding my bike on a treadmill. No matter how fast I pedal, the treadmill keeps up, so I don't roll off the treadmill.

Now, let's say that you come long next to me and grab my arm and start pulling me forward. Will you be able to pull me off the treadmill?
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4x4 in uppercase is $X$!!!
1997 R50: VG33E/RE4R01A/TX10/3.7/R200A/ARB/4.636/H233B/ARB/4.636/321150R15