buffalo.rb

class Car
  attr_accessor :speed, :acceleration, :braking, :velocity

  def initialize(velocity = 0)
    @velocity = velocity
  end

  def accelerate(acceleration)
    acceleration == 0 ?  @velocity + 1 : @velocity + acceleration
  end

  def brake
    @velocity =   @velocity  - 1
  end

  def brake braking
     @velocity = @velocity - braking
  end
end

car = Car.new(3)
# p car.velocity
p car.accelerate(66)