zigt (zigt) wrote in homework_help,


I am having a great deal of trouble trying to solve these problems.

1.An object falls from rest on a high tower and takes 5.0 s to hit the ground. Calculate the object’s position from the top of the tower at 1.0 s intervals. Make a position-time graph for the object’s motion. In your response, show what you are given, the equation that you used, any algebra required, a table of data, and your graph.
g = 9.8 m/s2

For this one I am having trouble with the concept of finding the position of the object with this limited information.

2.A car accelerates uniformly from +10.0 m/s to +40.0 m/s over a distance of 125 m. How long did it take to go that distance? Show all your work, including the equation used, given and unknown quantities, and any algebra required. Make sure your answer has the correct number of significant figures.

For this one, I think the problem would be easy if a time was specified so I could find the acceleration. However, time is what needs to be found. So, how do I go about doing this?

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For both problems, I suggest that you first make a list of what you are given, and then of what value(s) you need to find. Then, find the equation that involves all of those variables and use it to solve for the unknown.Keep in mind that you sometimes need to find a different variable with one equation, then plug it into another equation to find the final answer.

Hm...I've done that but there always seems to be some kind of information missing so I can't find a matching equation. I've tried finding the missing variable but in order to find the unknown variable...there is still not enough info mentioned in the problems.

Thanks though.
Let me put it this way: You'll need two different equations for each problem. A system of equations will eliminate the problem of multiple unknowns.
I think I figured it out now.
Thanks :)