Q. no. 9 a body falls freely from the top of a tower and during the last second of its fall, it falls through 25m. find the height of tower.

45.6m

Explanation:

The equation for the position y of an object in free fall is:

With the given values in the question the equation has one unknown v₀:

Solving for t=1:

1)

To find the hight of the tower you can use the concept of energy conservation:

The energy of the body 1 sec before it hits the ground:

2)

If h is the height of the tower, the energy on top of the tower:

3)

Combining equation 2 and 3 and solving for h:

4)

Combining equation 1 and 4: