Question

A body falls freely from rest. It covers as much distance in the last second of its motion as covered in the first three scond. The body has fallen for a time of-

(1) 3 sec (2) 5 sec (3) 7sec (4) 9 sec

Answer 1

5 sec !!
by using 1st law of motion
when a body has dropped from 125 m ,it covered 45 metre in first 3 sec !!
and last it covered 45 m alone