During regular service the Shinkansen goes 300 km/h or 186 mph. Test runs have reached 443 km/h or 275 mph for regular service trains and the Shinkansen as gone 581 km/h or 361 mph a world record.
How ever fast it was to go plus adding nitrous and sick tires helps too! I prefer a high class jet engine for mine but it's up to you
depends on the boat 8.7
Accelerration is the change of speed faster/slower.
It depends on the type of kart - from 50 kmph for rent-a-karts to over 200 kmph for professional Superkarts.