exam Maths Puzzle Numerical Ability

Could you help me solve this problem. Thanks.
d=v square/2g solve for g

I have two different answers and not sure which one is correct.

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exam Other Question

6/7x=84 Find the perimeter of a triangle if the three sides are:

square root 5 - square root 3
square root 5 + square root 3
4

thanks,