Which of the following real-world examples models linear motion? a. throwing a rock in the air at a 60-degree angle b. throwing a rock in the air at a 45-degree angle c. running 50 m along a straight track d. running around the curve of a track

Option C, Running 50 m along a straight track

Explanation:

Linear motion is one directional motion which requires only one dimension to explain it. This motion is along a straight line.  

In all other options either the motion is taking place along a curved path(as in option D) , thereby making it a curvilinear motion or the motion is taking place at some angle (as in option A and B) thereby making it angular motion.

hence, option C is correct.

straight or amphibians are homeothermic to thermal