While standing on top of a 256 m tall building, you see Iron Man flying straight down toward the ground at a speed of 32.0 m/s. Just as he passes you, you drop a can of Dr Pepper off the roof. How fast is the can going when it passes Iron Man?

Answer 1

when the can passes,

256 - 4.9t^2 = 256 - 32.0t

use that value of t for

v = -9.8t

Answer 2

ok thank you i got the right answer, but i do not understand where you got -4.9t^2 from. could you please explain that, so it helps me in the future.

Thanks