Answer:
His average speed is 980 units
Answer:


Explanation:
k = Coulomb constant = 
Q = Charge
r = Distance = 8 cm
R = Radius = 4 cm
Electric field is given by

Volume charge density is given by

The volume charge density for the sphere is 

The magnitude of the electric field is 
Work = (force) x (distance) =
(200 N) x (3.5 m) = <em>700 joules</em>