A boat develops a leak and, after its passengers are rescued, eventually sinks to the bottom of a lake. When the boat is at the bottom, what is the force of the lake bottom on the boat?

Explanation:

The force of the lake bottom on the boat = force the boat exerts on the bottom

force the boat exerts on the bottom  = weight of the boat - buoyant force on the boat

so  

The force of the lake bottom on the boat  = weight of the boat - buoyant force on the boat

So

The force of the lake bottom on the boat will be less than its weight .

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

i think the answer would be b