7. A spring balance reads force in Newton. The scale is 20 cm long and reads from 0 to 60 N. Find the potential energy of the spring when it read 40 N.

The potential  energy when it reads 40 N is

Explanation:

From the question we are told that

   The lowest reading of the spring balance is  0 N and this is at  0 cm = 0 m

   The height reading of the spring balance is 60 N  and this is at 20 cm =  0.20 m

   Generally the length corresponding to the reading of 40 N is mathematically represented as

=>    

Generally the potential  energy is mathematically represented as

Here

So  

=>  

they are non-matter

explanation:

they are non-matter. basically, any type of energy or any abstract concept is an example of something that does not matter. other examples include dreams, magnetism, radio, and hate

overcharge is the right answer system