Question

In a free fall condition the distance travelled in nth second is 60. The distance travelled in n+1 second is
80
85
90
70
Please answer

Answer 1

Use the formula Su = u+g(n-1/2)
For both the cases as how in pic
Ans is 70

Answer 2

Given,

let Initial velocity  of an  object  is  u and  acceleration is  a.

Let the distance traveled in n second  from initial position is   .

According  second  equation of  motion,

Distance traveled in  t second,



Distance traveled  in  n second,



Distance traveled in (n-1) second,



Hence,

Distance traveled in nth second,