Amaterial that breaks down quickly in the environment is called? ?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.