A parachutist descending at a speed of 10.0 m/s loses a shoe at an altitude of 40.0 m. (Assume the positive direction is upward.) when does the shoe reach the ground??

Answer 1

hf=hi+vi*t-4.9t^2
vi=-10 hf=0 hi=40 solve for time t

Answer 2

...and the answer equals??