A weight force of 10 N force acts on an object while the object moves 20m along horizontal ground. How much work is done by the weight force on the object? a) 0.5 J b) 2 J c) 10 J d) zero e) 200 J I already know it's not 200 J because I got the question wrong. Please show work!

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?

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

Aplane takes off from an airport and flies to town a, located d1 = 215 km from the airport in the direction 20.0° north of east. the plane then flies to town b, located d2 = 230 km at 30.0° west of north from town a. use graphical methods to determine the distance and direction from town b to the airport. (enter the distance in km and the direction in degrees south of west.)