Acceleration is used to describe the rate at which velocity changes. Speed is another way to say velocity, so a gain or a loss in speed is also known as acceleration.
So, acceleration can be negative or positive. It is positive if velocity is gained (increased) and negative if velocity is lost (decreased).
She inherited the hair color from only her mother because she has blonde hair like her mom and not her dad if she had gotten brown her then it would be from her dad but that’s not the case so she inherited from her mother