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I have just started a conceptual physics class and have not taken math or science in 6 yrs! Therefore, even some of the most fundamental physics questions are troubling me. I am not looking for answers, just logical steps to proceed with each problem. Below I will post some ideas that are giving me a headache.

1.Given a constant speed and time to stop, what is the acceleration?

I know that slowing down will cause a negative acceleration, so my answer should be negative.

2.Given two intervals of speed and the time is took to go from speed interval 1 to 2, what is the required acceleration? What I did was subtract the 2nd interval from the first and divided it by the time- I still do not know if it is correct.

3.Ball rolling off table with horizontal velocity, time to fall- how high is the table? I know that gravity will effect the ball by 9.81m/s/s- the book I have tells me to round the acceleration of gravity to 10m/s/s- which I do not like; I have no idea where to start though.

4. Same as 3 but given table height and horizontal velocity, what is the distance from base of the table where the ball will strike? Both 3/4 deal with gravity and this damned ball. Having gravity in my problem seems to throw me off. Is horizontal velocity dependent on vertical velocity? Does time to hit the floor depend on the balls horizontal velocity? Should I be worrying about Initial velocity? or can I assume that the ball is initially still, thus showing an initial velocity of 0?

Thanks again to anyone that can assist me. Again I am not looking for final solutions, just ways to think about these problems when I see them and which formulas to use appropriately. These are the 4 questions out of 20 that are giving me trouble.

~Dsoto489

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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# Conceptual Physics

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