based off the size and voltage of the motor I'd say it's good for powering a passenger car as 9" motors are one of the most popular sizes for cars and light trucks and you should be able to run it at a higher voltage then 48v assuming it has four lugs on it for connecting power to it then it's a series wound motor and the only issue you can have is over speeding the motor by not having it under load or by having it geared in a way that it over revs, gearing it to run at 4,000rpm or slower is pretty common but you should be able to run it at up to 5,000rpm as long as it doesn't go faster, faster and it will explode/fly apart.
You might also take it to a motor repair shop and see what they can tell you about it.
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