The postman delivers post. He starts at the post office and walks 20 m east towards the school. Thereafter he walks 50 m west to deliver a parcel to the church. The whole route
takes him 50 s. Calculate the average velocity of the postman

An electron is ejected into a horizontal uniform e⃗ field at a parallel horizontal velocity of v0. assume the electron's initial position x0, initial velocity v0, time t, magnitude of electric field e, electron's mass m, and the magnitude of the electron's charge |e|. ignore the force that earth exerts on the electron. assume the e⃗ field is in the same direction as the initial velocity. part a define the equation for the electron's velocity. express your answer in terms of the variables v0, |e|, t, e, and m.