The ship shown in Figure 4.6 is travelling at a constant velocity.
a. Is the ship in equilibrium (in other words, is the resultant force on the ship equal to zero)? How do you know?
b. What is the upthrust U of the water?
c. What is the drag D of the water?

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upthrust U force of engines F = 50 kN drag D weight W= 1000 kN Figure 4.6: For Question 2. The force D is the frictional drag of the water on the boat. Like air resistance, drag is always in the opposite direction to the object's motion.