If you mean "acceleration", that is the rate of change of velocity - how quickly velocity changes. For example, if an object falls down without air resistance, close to Earth's surface, its speed will increase by 9.8 meters per second every second. This is commonly written as 9.8 meters/second2 - and this rate of change of velocity is called "acceleration".
About 9.8 meters per second squared (m/s2) downwards.
Acceleration is the rate of change in velocity (speed) Thus if your speed is constant (50 miles per hour) your acceleration is zero
height=acceletation(t^2) + velocity(t) + initial height take (T final - T initial) /2 and place it in for time and there you go
Check for a serious exhaust leak if this sound occurs on rapid acceletation. Squealing also occurs in power steering if it is low on fluid and you are cornering. Another squeal is a slipping fan belt ... get it checked out soon as it will only get worse and probably cost more later for repairs than for a simpler repair right now.