Science quiz linktarding

[miajag]

The object wouldn't instantly stop upon hitting the water either.

[traz]

Wow some of you are really nitty

[daryn]

exactly miajag,

so it becomes a thing where you're like.. ok what's the final velocity WHEN? right upon impact? (correct), after the water has absorbed most of the kinetic energy? (no), after the object sinks to the ocean floor and comes to rest? (god no, idiot)

[Knight Vision]

can we just get back to the chicks now?

[Jasper109]

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Guys,

Those of you complaining about the ambiguity of the final velocity question will probably be faced with countless vexing dilemmas in day-to-day life. Like, "buy one get one free" - GET ONE WHAT FREE?!?!?!!????!

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I think the point is that the way the question was worded 0m/s is NOT an incorrect answer.

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i still say it is definitely incorrect i guess.

in such a problem when you're talking about final velocity, there's a starting and ending point. the question states the object takes 10 seconds to hit the water. right away you should be thinking: starting point = drop, ending point = hit water.

final v = v @ impact w/ water. in my opinion there really is no other way to interpret this. i wonder what borodog would say?

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It doesn't say for what point in time you want the final velocity even though it mentions that it takes 10s to hit the water.

The question should be "with what velocity does the rock hit the surface of the water?"

You can have a question where the rock enters the water and then maintains a constant velocity until it finally comes to a complete stop.

In that case you'd have to stipulate at what point you are finding the final velocity for.

I realize I'm being a nit, but if you write a [censored] up question you end up with a student challenging you on it.

[Jasper109]

One more thing. Just don't have 0m/s as one of the choices. Problem solved.

[Jingleheimer]

If you are going to nitpick over the 'final' velocity, you should also take issue with:

large truck and small car- my car is filled with lead and the truck evacuated, WTF?

the sun causes tidal effects too

we are not told in the final velocity problem how fast the helicopter is moving vertically; we don't have enough info to solve this problem.

[forshure]

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73%

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[daryn]

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It doesn't say for what point in time you want the final velocity even though it mentions that it takes 10s to hit the water.

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no [censored]!

but it becomes obvious as soon as you read "object takes 10 seconds to hit the water" AND NOTHING ELSE AFTER THAT.

if the problem read:

"an object takes 10 seconds to hit the water. the body of water is 1000 feet deep. assume constant density of xx. what is the final velocity of the object."

then it damn sure would be zero. but that would be a pretty stupid question.

[Duke]

Final velocity relative to what?