Answer: Your correct main answer is a submarine
Explanation:
Submarines are usually used for underwater warfare, and naval submarines are equipped with torpedoes, missiles, and high-powered nuclear weapons. The use of these along with their advanced tracking system helps to target ships and boats from below as well as other enemies. They can also work on targets that are on land.
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If the hypothesis is tested extensively and if competing hypothesis are eliminated. Pretty much your hypothesis has to be tested many times and precisely accurate each time.
Reading of the scale will be given as Normal force on the man
So here we can say that
weight of the mas will be
normal force on the man will be given as
now net force is given by Newton's II law
a = 3.33 m/s^2
so elevator is accelerating downwards with an acceleration a = 3.33 m/s^2
