Answer: a.
Explanation: i have done this before .. hope this helps (⌐■_■)
Answer:
90 N
Explanation:
The electrostatic force between two charges is given by:

where
k is the Coulomb's constant
q1, q2 are the two charges
r is the separation between the charges
In this problem we have
q1 = q2 = 0.005 C
r = 50 m
So the electrostatic force is

Answer:
W = m g h work that must be done on car
P = W / t power that must be input (in Watts)
P = m g h / t = 1500 kg * 9.8 m/s^2 * 360 m / 60 sec
P = 88,200 watts
P = 88,200 watts / 746 watts / hp = 118 hp
Work = (500N)(15m)=7500J Power= (7500J)/(20s) =375 W
Hopefully this helps