Question

A block of wood weighing 25 N is subrnerged under water. If the net force on the wood is 5 N upward, how much buoyant force is acting on the wood?

A) 30 N upward
B) 20 N upward
C) 5 N upward
D) 25 N downward

Answer 1

A) 30 N upward

Step-by-step explanation:

There are two forces on the block: buoyant force up and weight down. The net force is 5 N up, so:

5 N = B − W

The weight is 25 N so:

5 N = B − 25 N

B = 30 N

The buoyant force is 30 N up.