800 joules of work was done lifting a 200 newton box to a shelf directly above the box. how many meters high was the shelf?

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?

Sunidhi made a study chart about changes in states of matter. which headings best complete the chart?

Positive ions differ from neutral atoms in that