Answer: Masses of the two objects added together
Explanation:
Answer
40 degrees
Explanation
When waves hit a surface they get reflected. The law of reflection states that the angle of incidence is equal to the angle of reflection. In this case, the law of reflection tells us that if the angle of incidence is 40 degrees, the angle of reflection is 40 degrees.
To warn the people that are going to be affected by it, for evacuations and such
