These are 5 problems out of a set of 40 or so that were giving me a really hard time. Some I just can't figure out while others it seem are missing vital information. I'm also having a hard time finding equations for some. Any help, tips or equations that would work would be of great help and highly appreciated. Thanks a lot in advance. 1. The problem statement, all variables and given/known data 1) I threw a ball straight up and caught it at the same location. It took 8.0 seconds for it to go up how high did it go and how fast was it thrown. 2) I have three forces acting on a 5.0kg object. What direction does it go, with how much net force is it pushed and what's it acceleration. Forces: 30.0N at 20.0 Degrees 40.0N at 10.0 Degrees 10.0N at 150.0 Degrees 3) An inclined plane has an angel of 30.0 Degrees. On it is a box with a mass of 60.0kg which is attached by a massless pulley to another 40.0kg mass. The frictional coefficient is .15. What is the acceleration of the larger mass with magnitude and direction. 4) On a Cartesian plane, there is a 5.0nC charge at the origin, a 3.0nC charge at (-3,0) and a -7.0 nC charge at (0,-4). What is the net force(magnitude and direction) on the 3.0 nC charge. 5) A bucket of water is attached to a string and swung around. Find the minimum speed required to keep the water inside, if the radius is 0.60 meters. 3. The attempt at a solution 1)This one stumps me. All I'm given is time. In order to figure this out I would think I would have to have values for either the mass of the ball or the speed at which it was thrown. 2)This one is confusing me from more of a visual standpoint. When it gives the angles I'm not sure how to visualize this. I just don't know where the force is pushing on the object. This is how I think of it but I'm pretty sure its wrong. I just don't know what to use as a marker. 3) I just can't figure out what equation would be relevant to this situation. 4) Once again I can't think of what equation to use. I've searched my notes I have but can't find anything. 5) All I'm given is the radius. The equations I have would require acceleration or mass of the bucket. Thanks again in advance.