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The terminal velocity reached by the tank is: 278.3 m/s

Mass of the tank with passengers: 19’614 kg

Frontal projected surface: 6.76 m2

Density of air: 1,225 kg/m3

The density of water: 998 kg/m3

The drag coefficient: 0.6 (approximated by its wedgelike shape)

You don't have to solve it for me, I just would appreciate some guidance in which way I should tackle this problem. Many thanks.