[填空题]
A helicopter is ascend5 bnw .)+ju1c 5+sjuy2wz.aiy2 iq itdbgha+xdac oum )de.o0j94b0 3ing vertically with a speed 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.]
