Linear velocity or acceleration: which is being demonstrated in the
photo? This is
Thrust SSC , a British car that set the world's land speed record in
Nevada in 1997: 763 mi/hr. (That's 341 m/s, 2% faster than the
local speed of sound) Look carefully, you can see
evidence of the
"supersonic shock wave" refracting light above the car.
"... by the time it was level
with the spectator area it was already braking, trailing the brake-chute
behind it. But we still hadn't heard a thing - just silence. Then it came,
first the sound of the engines then BOOM, BOOM - two huge sonic booms which
seconds later echoed off the surrounding mountains...
The booms upset pictures on the wall of the saloon in Gerlach, ten miles
away but I suspect they were already crooked! "
