Final answer:
In physics, the convention is to assign a negative sign to an object moving downward and consider rightward and forward directions as positive.
Step-by-step explanation:
In the context of physics, when describing the motion of an object, the convention for assigning signs to directions is arbitrary and based on the chosen coordinate system. In most cases, the upward direction is considered positive and the downward direction is considered negative. Therefore, the answer to the question 'Which sign is assigned to an object moving downward?' would be:
Additionally, when setting up a coordinate system for describing motion, the rightward and forward directions are typically considered positive as per conventional standards. Thus, to the question 'Which of the following are conventionally considered positive?' the answer would be:
- c. forward and to the right.