The most massive automobile to have been manufactured on a regular basis was the Russian-made Zil-41047. If one of these cars was to move at just
8.9 m/s, its momentum would be 2.67 x 10^4kg • m/s. Use this information
to calculate the mass of a Zil-41047.

Use the formula for momentum:  Momentum = (mass) x (speed)

2.67 x 10⁴ kg-m/s  =  (mass) x (8.9 m/s)

Mass  =  (2.67 x 10⁴ kg-m/s) / (8.9 m/s)

Mass  =  3,000 kilograms

That's 3 metric tons.  On Earth, it weighs 6,614 pounds, or 3.3 US tons.

It probably performs a lot like my car.