Answer:
you have probably missed some details in the question.
<span>The reason that the balloon will stick to the wall is because the negative charges in the balloon will make the electrons in the wall move to the other side of their atoms and this leaves the surface of the wall positively charged.</span>
<span>The reason a static method can't access instance variable is because static references the class not a specific instance of the class so there is no instance variable to access.</span>
These forces form a force pair. Use Newton's third law, and you see that the trailer pulls back at with the same force. The answer is d.
