Write a class definition for an abstract class, Vehicle, that contains: a double instance variable, maxSpeed a protected double instance variable, currentSpeed a constructor accepting a double used to initialize the maxSpeed instance variable an abstract method, accelerate, that accepts no parameters and returns nothing. a method getCurrentSpeed that returns the value of currentSpeed a method getMaxSpeed that returns the value of maxSpeed a method, pedalToTheMetal, that repeatedly calls accelerate until the speed of the vehicle is equal to maxSpeed. pedalToTheMetal returns nothing.