avg vel is 5 m/s (Va)
during .2 s passage, accel (A) is ... .2 * g
find vel at top of window .. Vt = Va - (A / 2)
find fall time (Tf) to top of window ... Vt / g
drop distance is ... 1*2 * g * Tf^2
A falling stone take 0.2s to fall post a window with. Hight 1m from how far above the top of window stone dropped
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