Question

please help me out of this question

Answer 1

use
s = u×t+(1/2)×a×t×t
write this equation for n second means replace the t by n .
and now write equation for n-1. as the time ( replace t by (n-1))
now substract the second equation from one you will get the distance in the nth second.
now put the n as 5 because we took (n-1) and n. as 4 to 5 second.




you can use (n +1) instead of (n-1)
but for n that time we have to use n=4.