Deceleration basically means slowing down - reducing speed A negative answer for an acceleration would actually be a deceleration Like acceleration, deceleration is also measured in ms-2
The act or process of moving, or of causing to move, with decreasing speed Sometimes called negative acceleration
When a vehicle or machine decelerates or when someone in a vehicle decelerates, the speed of the vehicle or machine is reduced. the sensation of the train decelerating. accelerate + deceleration de·cel·era·tion The harder the brake pedal is pressed, the greater the car's deceleration. acceleration
When the rate of something such as inflation or economic growth decelerates, it slows down. Inflation has decelerated remarkably over the past two years. accelerate + deceleration de·cel·era·tion a significant deceleration in the annual rate of growth. acceleration. to go slower, especially in a vehicle = slow down accelerate