If we neglect friction, what is the acceleration of the following object ? Assume mass of the object is 2kg F=20N for the object

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black

Anne applies a force on a toy car and makes it move forward. what can be said about the forces acting on the toy car at the moment anne applies the force?