a 1400 kg car experiences a total ret arding frictional force of 700 N as it climbs a 10 hill at a constant 80 km/h. How much power must the car be able to generate through its wheels to do this?

Ithink the answer would be 1,350!

It really doesn't matter for any of the questions that you've listed.

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.