An object from the rest covers the last 75% of it’s fall (with respect to height) in1sec. from what height was it dropped?

19.62 m

Explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration

Now the initial velocity of the last half height will be the final velocity of the first half height.

Since the height are equal

Time taken to first 25% of the fall is 1 second

Total time taken = 2 seconds

The height from which the object was dropped was 19.62 m