Posted by l on .
An object is thrown vertically upward at 18m/s from a window and hits the
ground 1.6s later. What is the height of the window above the ground?(air
resistance is negligible)

Physics 
drwls,
Let h be the window height above ground.
At t = 1.6 seconds,
Elevation y = h + 18t 4.9t^2 = 0
so
h + 28.8 12.54 = 0
h would be negative. It cannot hit the ground that soon if thrown upaward at that high speed. Recheck you numbers