//Height from which stone fell
//refer fig.12.7
//Let the stone be dropped from A at a height h above window
//h=(g*t^2)/2  ...(1)
//h+2.45=((g)*(t+0.5)^2)/2  ...(2)
//from (1) and (2)
t=0.2495  //sec
g=9.81  //m/sec^2
h=(g*t^2)/2  //m
printf("\nh=%.3f m",h)