[填空题]
A helicopter is ascending vert ye6glk1- qes fit /,2vnzf*6u keoea;;frb +:ically with a speed0 tpecdh(,ws; of $9.50 \; m/s$. At a height of 225 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? $s$ [Hint: The package’s initial speed equals the helicopter’s.]
