Asubmarine is 50 m below the surface of the ocean and its weight is exactly balanced with the thrust. if it descends to 100 m and stops, the buoyant force (thrust) (a) does not change
(b) decreases
(c) increases
(d) cannot be determined
(e) the direction is reversed
and why?

(a)does not change

Explanation:

Given

Submarine is 50 m below the surface

Now submarine descends to 100 m and stops

As we know that pressure difference at a depth of h is given by

where =Density of fluid

g=acceleration due to gravity

h=height below free surface of liquid

buoyant force is equal to volume displaced by object

as the submarine is already in water therefore buoyant force will remain same.

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.