Please help me A stone is thrown straight upward, slightly out from the corner of the roof of a building. The initial upward speed of the stone is 20 m/s as it leaves the hand of the thrower. Assume that the stone is 50.0 m above the ground when it is released.
Assume that the initial position of the stone is at y = 0 and that positive y is up
Find the following:
1. The time needed to reach max height
2. The max height
3. The time needed to get back to initial height
4. The velocity of the stone in #3
5. The height of the stone at 5 seconds
6. The velocity of the stone just as it hits the ground

Aflask with vinegar in it has a mass of 160 grams. a balloon with baking soda in it has a mass of 40 grams. the balloon is attached to the flask to seal the opening and the vinegar and baking soda mixes. the balloon inflates to a large volume. what will the total mass of the balloon and flask be after the balloon inflates? explain. a) less than 200 grams because the solid baking soda disappears. b) 200 grams, because all the atoms remain in the balloon or flask. c) more than 200 grams because the size of the balloon is so much larger. d) less than 200 grams because gases such as the one in the balloon are lighter than solids and liquids.