Answer:
It is a misconception that theories turn into laws with enough research.
Hope it helps
(b) Always act on the different bodies in opposite directions
One side of the wave changes speed before the other side, causing the wave to move
Missing question: "What is the spring's constant?"
Solution:
The object of mass m=6.89 kg exerts a force on the spring equal to its weight:

When the object is attached to the spring, the displacement of the spring with respect to its equilibrium position is

And by using Hook's law, we can find the constant of the spring: