Question: A stone is thrown vertically upward with a speed of 24.0m/s.
a) how fast is it moving when it is at a height of 13.0m? I got 17.9 m/s
b) How much time is required to reach this height? I got 4.28s and 6.20s
c) Why are there two answers to b? I said because the stone reaches the given hieght two time, on the way up and then again on the way down
d) What is the stones mass height above the place it was thrown?