Study of motion_______________________________________________________________________________________________________________________________________________________________________________________________________________________15. AccelerationFrom rest, a rally car can reach a velocity of 100 km/h in 2,5 s or less. It gains velocity very rapidly. It has a high acceleration.Like velocity, acceleration has a direction, it is a vector quantity. Acceleration is calculated as follows:
An object is said to be accelerating if it is :
- Speeding up- Slowing down- Changing direction- Speeding up and changing direction- Slowing down and changing directionAcceleration can be positive or negative. If a car has an acceleration of -4 m/s2, it is losing 4 m/s of speed every second. A negative acceleration is sometimes called deceleration.