A body is moving from rest under constant acceleration and let $S_1$ be the displacement in the first $\left(P-1\right)$ seconds and $S_2$ be the displacement in the first $P$ seconds. The displacement in ${\left(P^2-P+1\right)}^{th}$ second will be

• Correct answer
  A

  $S_1+S_2$
• B

  $\sqrt{S_1{S}_2}$
• C

  $S_1-S_2$
• D

  None of these

Hence, the correct answer is option: 'A'.