A car's provides by computing average speed over a very short period of time using the circumference of the car's tires divided by the time it takes to complete a single rotation

Your answer is 1.5 hope i  

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.

The acceleration is 7