- P78 Consider the VPython program shown below. (a) An important skill is being able to read and understand an existing program, in order to be able to make useful modifications. Before running the program, study the program carefully line by line, then answer the following questions: (1) What is the initial velocity of the particle? (2) Is the particle initially located in front of the box or behind it? (3) In which line of code is the position of the particle updated? (4) What is the value of the time step t ? (5) Will the particle bounce off of the red box, or travel through it? (b) Now run the program, and see if your answers were correct. (c) Modify the program to start the particle from an initial position on the +x axis, to the right of and in front of the red box. Give the particle a velocity that will make it travel to the left, along the x axis, passing in front of the box. from visual import * box (pos =vector (0,0,1), size =(5,5,0.5), color color.red, opacity =0.4) particle = sphere ( pos = vector (5,0,5). radius =0.3, color=color, cyan, make_trail - Truel v= vector (0.5,0,0.5) delta_t =0.05 t=0 while t \& 20: rate (100) particle.pos - particle.pos + y. * delta_ t=t+ deltast