It seems like you are trying to solve for the initial velocity $v_0$ of the second stone, but I'm missing some context for the specific problem you're working on. The unit for initial velocity should be in feet per second (ft/s), not feet per second squared (ft/s²) which is a unit of acceleration.

Based on the dropdown options you provided, the correct unit for velocity is:

$v_0 = \text{ft/s}$

If you can provide more details about the problem—such as the motion of the stone, time, distance, or any forces involved—I can help you calculate the initial velocity.

Would you like to provide more information, or upload an image for further assistance?

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Here are 5 questions that could help expand the situation:

1. What is the height from which the stone is dropped or thrown?
2. Is the stone thrown upwards or downwards?
3. How much time does it take for the stone to hit the ground?
4. Is there any acceleration due to gravity considered in the problem?
5. Do you have the final velocity of the stone before it hits the ground?

Tip: Always ensure that the units for velocity are consistent with the system (SI or imperial) used in the problem.