Question

a stone is dropped from the top of Tower and travels 24.5 m in the last second of a journey find the height of a tower

Answer 1

u= 0m/s
g= 9.8m/s
Let, the nth second be the last second.
h nth=u+g/2 (2n-1)
24.5m=0m/s+9.8/2 (2n-1)
24.5m=4.9(2n-1)
24.5/4.9=(2n-1)
24.5/4.9+1=2n
3sec=n
Height of the tower= ut+1/2gt2
=0+1/2×9.8×9
=44.1m