4 point charges of 50 [nC] each are located at the four corners of a square lying in the x-y plane and centered on the origin (0, 0, 0) in free space. The diagonals of the square are of length 2 m and lies along the x and y axes. (a) Calculate the total force F on each of the charges by the other three charges, (b) What is the electric potential at the center of the square due to all four charges. (c) What is the electric field intensity at the center of the square due to all four charges.

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