Question

A body is dropped from rest from a height h. It covers a distance 9h in the last second of fall. The height h is_m ​

Answer 1

Answer:If total distance covered by the body is H then the formula is

h = ut + 1/2at2 for total distance covered by the body.

And distance covered in nth second by the body is given by

 

h = u + a/2(2n-1)

 

for u = 0,

 

h= a/2(2n-1) and h=1/2at2. here a= g= 10m/s2.

 

if total time is t seconds, the last second will be tth second. and the distance covered in the tth second is 9h/25.

 

Put the values in the two equations and solve them and you will get the answer