What is the mass of a box that has 300J of KE and is traveling at 15 m/s?

Aregular polygon has angkes of size 150° each.how many side has the polygon

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?