What change should Lucia make? She should change the length of each vector that is tangent to the circle so that it is the same as the vector pointing toward the center at that point.
She should change the direction of the vectors that are toward the center of the circle so that each points tangent to the circle opposite the existing tangent vectors.
She should change the direction of the vectors that are toward the center of the circle so that each points away from the center of the circle.
She should change the lengths of the vectors that point toward the center so that each is the same length.

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

heat the gas and measure the pressure

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach