1. A hot-air balloon is ascending at the rate of 11 m/s and is 53 m above the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground? 2. v = u + at s = ut + 1/2 a t^2 v^2 = u^2 + 2as 3. s = 53m u = 11 m/s v = a = -9.8 m/s^2 t = So far I've tried v = u+at, but stoppped when i realised I had 2 unknowns. ( v = 11 + -9.8 t ) I've also tried s = ut + 1/2 at^2 to no avail ( 53 = 11t + 1/2 (-9.8) t^2 ) Also tried v^2 = u^2 + 2as but I got something like -1000 so it didn't make sense to me. I've hit a mental block, and it doesn't look like i's going to move any time soon, which isn't helpful since this thing is due in 10 hours. Sorry if I've put this in the wrong place or with the wrong title, because right now I'm not sure what it is, oher than a torture device. The answer will probably turn out to be easy to get, but right now it isn't working for me. Any and all help would be greatly appreciated.