A student estimates the maximum speed of some different moving objects.
Which maximum speed is not a reasonable estimate?
1 )
container ship: 10 m s$^{-1}$
Olympic sprinter: 0.1 km s$^{-1}$
3 )
racing car: 9000 cm s$^{-1}$
4 )
snail: 0.01 km h$^{-1}$
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