Question

If a stone dropped from the top of the tower travels half of the height of the tower during last second of it's fall the time of fall is ??

Answer 1

let the height be 100 m
last one second distance =50m
seconds equation of motion
we get
50=u + 1/2*10*1
u=45 m/s
now use first equation of motion
45=gt
t=4.5 seconds
total time = 5.5 seconds