What is the velocity of 25 seconds a) 20 b)30 C) 40

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

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?

Could we see a galaxy that is 20 billion light-years away?