physics HELP

Question

A supertanker (mass = 1.57E+8 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.47E+5 N. Determine the magnitude of the resistive force exerted on the tanker by the water.

Answer 1

If it moves at constant velocity, it is not accelerating, and therefore the resistive force must balance the thrust.  The magnitude of the resistive force must be 7.47 x 10⁵ N.