Answer:
(A). The flux is 0.336 N.m²/C
(B). The flux is zero.
Explanation:
Given that,
Length = 4.2 cm
Width = 4.0 cm
Electric field 
Area vector is perpendicular to xy plane
(A). We need to calculate the flux
Using formula of flux

Where, E = electric field
A = area
Put the value into the formula



(B). Given electric field

We need to calculate the flux
Using formula of flux

Put the value into the formula

Here, The component of k is not given
So, the flux is

Hence, (A). The flux is -0.336 N.m²/C
(B). The flux is zero.
If the mass of both of the objects is doubled, then the force of gravity between them is quadrupled; and so on. Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces
Kinetic Energy = 1/2mv^2
m= 1200kg
v= 24 m/s
KE = 1/2 (1200kg)(24m/s)^2 = 345,600 N