Question

someone please help, step by step i'm so lost :(

Answer 1

d = 1/2 * a * t^2 - Given
2d = a * t^2 - Multiply each side by 2
2d/a = t^2 - divide each side by a
t = square root (2d/a) - take the square root of each side
$t = \sqrt{ \frac{2d}{a}}$