PLEASE, NEED HELP WITH ALGEBRA ASAP!

Answer: The answer is (D) t = √2d/₅
Step-by-step explanation:
Since a = 2d/t²
Now making t the subject of the formula
at² = 2d
t² = 2d/a, to find t , take the square root of both sides
t = √2d/₅ since a = 5m⁻².
The answer is d