A baseball is tossed from street level by a student straight up at 25.3 m/s. After it starts falling, another student - who is on the roof of the school at a height of 17.4m - catches it. How long
does this take?

no simpler subs form complex ones. synthesise = make

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

prndulum needs thread, weight clock to time swings