Question

a small submarine of mass 1000kg sinks in water with uniform speed of 2m/s
What is the resultant force exerted on the submarine as it sinks
(a) 5000 N
(b) 10000 N
(c)0
(correct answer is 0 why?)
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Answer 1

Answer:

c) 0

Explanation:

For the submarine to move with the constant velocity, the resultant force acting on it must be zero. If not, it may accelerate.

In this case, the gravitational force acted on submarine by earth (mg) is balanced either by the external force or force due to surface tension or both. The total net force becomes zero and submarine moves with constant speed.

Answer 2

Answer:(b)

Explanation:

if the submarine is 1000kg the submarine as it sinks 10000 N