<grin> Who said anything about speed? I just said "it would look like full size"...
The problem is acceleration. Basically a 1/10th car still accelerates (in any direction) at about 1g - but the size is scaled, so if it falls (after jumping) at 10 m/s^2, it looks like 100 m/s^2 or 10g, because it's ten times as many car lengths per second.
Similarly for cornering, assuming the tyres produce about 1.0 coefficient of friction.
Slow it down by the square root of the scale, and the acceleration (jumping/falling and cornering) should make it look like it's full size.
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