Question

a spring balance reading 15g wt for a mass suspended at it is dropped .What will it read during the course of its fall​

Answer 1

Answer:

The spring balance will read zero during the course of its fall.

Explanation:

Since the spring balance and the suspended mass are dropped, we can say that they are in free fall. During free fall the objects will feel the phenomenon of weightlessness. By Newton's third law of motion, every action should have an equal and opposite reaction. When an object is weighed, action force is given by the body on the spring balance, and reaction is provided by the spring balance on the body. But during a free fall, the spring balance cannot be able to give a reaction force on the body. This will result in the feeling of weightlessness and the spring balance will read Zero on its scale.