You see a hot air balloon rising above a top of a hill, what is the top of the hill called? A.) Delta point B.) Distance system C.) Coordinate system D.) Reference point

Physics · Middle School · Tue Nov 03 2020

Answered on

Here, option (D) is correct. 

When a hot air Ballon is rising above the top of a hill, the hill will be known as reference point as Ballon is going up, a reference point is taken to determine whether an object is in motion.