Stored energy and the energy of positions are energy

The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?