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Doesn't seem like a very middle question to enjoy. The question basically sats you have "Lego robot that can knock A tennis ball off the long long table." So you already have a robot that can knock this off the table, it really isn't important that if it's made of Legos or not. Now what sort of sensor would you add so it won't fall off the table as well. It specifically asks about the sensors. Don't make questions harder than they are

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Don't make questions harder than they are.

There's no need to make it any "harder" - the point is that just wasn't well-articulated to begin with. (Noting again that "well-articulated" is very different from fuzzy / ambiguous, in the engineering sense).

And given that the people you want to hire, by definition, are generally very busy (and have many, many important things to do with their time) -- even when they aren't currently working (despite the urban legend that "they always have jobs") -- as such, it just isn't a good use of their time.

I have no ideal what the question asks for. What kind of sensor are there? And I did lego robot a while back for optional credit in college (mine worked well).

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