So they believe what you say. It would be a waste of time to communicate with your audience if they dont even believe you.
Gravity, but if you think about it, air resistance can slow the object down, thus meaning that there are 2 forces acting on the object, but just go with gravity
The symbolism of the new cloak in this excerpt is - the new cloak represents Odysseus's transformation from a weary traveler to the returning hero.
He spent many years on the sea, far from his family and loved ones, and he became old and tired. This new cloak is his transformation - he is a hero now, and he has come back to Ithaca to rule again.