Answer:
The correct option is (b).
Explanation:
Given that,
Electric field, 
We need to find the magnitude of the force on the electron as a result of the electric field.
We know that, the electric force is given by :

So, the required force on the electron is equal to
.
The simplest answer would be "acceleration due to gravity."
The exact value of this acceleration changes depending on which planet your on (for example).
Answer:

Explanation:
The formula for kinetic energy is:

We can plug in the given values into the equation:



The centripetal force is provided by the friction between the tyres and the ground. That's why a car will slip on ice, because there is less friction.