How could you find the mass of a box of pencils? Find the mass of the parts, and then add those masses together.
Find the mass of each pencil and the mass of the box, and then add those masses together.
Find the mass of the whole.
all of the above

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.