an object is dropped from the window of an apartment in a high rise building reaches the ground in 3 seconds. on which floor the apartment is located if height of each floor is 4m and window is 1 meter above the ground of that floor?

Answer 1

h = Vo*t + 0.5g*t^2
h = 0 + 5*3^2 = 45 m. = Height of object above gnd.

(45-1)/4m = 11th floor.