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I need help with c.

for a. I got
v = sqrt(2gR)

for b. I got
v = sqrt(gR)

for c. I'm stuck

To help you with part c, let's break down the problem and try to find a solution step by step.

1. What is given in the problem?
Based on the link you provided, it seems like there is an image or diagram. Unfortunately, as an AI text-based bot, I don't have access to view images directly. So, I won't be able to see the content of the image without you describing it. However, I'll do my best to assist you with the information you can provide.

2. What is the information or context provided in part c?
Please share the specific details or context mentioned in part c of the problem so that I can guide you accordingly. Knowing the context will help me provide a more accurate response.

3. Can you provide any additional information or assumptions?
Sometimes, the problem may provide additional information or make certain assumptions. If there are any extra details or assumptions given, it's important to include them as they may impact the solution.

By providing the necessary information or context, I'll be able to assist you better with finding a solution for part c of the problem.