A body covers `12 m` in ` 2nd` second and `20 m` in `4 th second` . Find what distansce the body will cover in ` 4 second` agter the ` 5 th second`.

Explanation

Distance coverd in ` 4 ceconds after the fifth second ` = S_9 - S_5`. The distance covered in (t)
seconds is given by `, ` S=ut + 1/2 at^2 ` and
Distance coverd in nth second is given by, `
D_n = u + a/ 2 ( 2 n- 1)` .