A body dropped from the top of a tower covers a distance 7x in the last seconds of its journey, where x is the distance covered in the first second how much time does it take to reach the ground.
(a) 3s.
(b) 4s.
(c) 5s.
(d) 6s.
Answer is (b) 4s
xn = (g/2) (2n - 1) and x1 = g/2 (2 - 1) = g/2.
