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I am working on Projectiles in Physics and as I was doing some questions I noticed that nowhere in my notes do I have a way to solve for horizontal and vertical velocity.

So, here is a question for horizontal velocity that I am working on with different numbers added in (so I can figure the actual question out on my own):
QUESTION
A marble rolls off a desk that is 0.89m above the floor with a horizontal speed of 1.4m/s. What is the marbles horizontal velocity when it is halfway to the floor?
ATTEMPT AT SOLVING
V = d / t
V = 0.89 / 1.4
V = 0.63

But I believe I am wrong somewhere and I do not have a question for vertical velocity but can someone explain it to me, please?

Thanks.
 Mar 10, 2014
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Hi tannawirsch,

I think you are suppose to assume that the horizontal velocity stays the same.
Afterall, it is not being acted upon by gravity and friction with the air is insignificant.
So th horizontal speed stays at 1.4m/s until it hits the floor.

Melody.
 Mar 10, 2014

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