Answer
a). A life jacket should have lower density than water. This is because the average density of the person with jacket should be less than density of water.
b) Salt water density is greater, so it can exert more buoyant force.
Work Step by Step
a). A life jacket should have lower density than water. This is because the average density of the person with jacket should be less than density of water.
b) Salt water density is greater, so it can exert more buoyant force.
