Four Charges equals to -Q are placed at the four corners of a square and the charge q is at its centre.If the system is in equilibrium,what is the value of q ?

A buoy lies 1000metres east and 2000m north of a start line. A boat starts at start line and travels on a bearing of 045deg at 6ms-1. After 6 minutes the boat turnd and increases speed tp 9ms-1. How long does it tak boat to reach buoy?

Two equal masses travel towards each other on a frictionless air track at speed pf 60cms-1 and 30cms-1.they stick together on impact what is the speed of the masses after impact?

I am trying to predict how long a rocket will take to predict its trajectory, given target location, general rocket information, starting position, etc. I am currently in high school and working on my science fair project. I have people who would be willing to explain higher level math/physics to...