A rock is thrown downward from the top of a 40.0-m-tall tower with an initial speed of 12 m/s. Assuming negligible air resistance, what is the speed of the rock just before hitting the ground?
i asked this question somewhere else, but i still don't understand how to do it,
the person told me to "Make assumptions like negligible air resistance, starting velocity is zero.
Combining and rearranging the equations:"
Ek = 1/2mv^2
Eg = mg(delta)h
but i do not know where to put what in.
the only thing i did was i draw the diagram, i have no idea what else to do.
can you please explain how to do this.