Answer:
Maximum force will be equal to 720 N
Explanation:
We have given that spring constant 
Maximum stretch of the spring x = 6 cm = 0.06 m
We have to find the maximum force on the spring
We know that spring force is given by

So the maximum force which is necessary to relaxed the spring will be eqaul to 720 N
Answer:
the answer is kg
Explanation:
because the s.i unit for mass is kilogram
The answer would be a nail rusting, but really it could be any of these.