H=dist. of roof to window top. h=ht. of ground to window bottom. u=vel when ball first crosses the window top. v= the vel when ball first crosses the window bottom.
u = 9.6m/s=underoot[2gH] H=4.6m --------------------- v=u+1.25 = 10.85 h = vt + 0.5*g*t*t here time taken is 1sec[half of 2sec] h=14.85m --------------------
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