Last updated at June 3, 2019 by Teachoo
It is the rate of change in velocity over time Formula for Acceleration Acceleration = Change in Velocity/Time Taken Acceleration = (Final Velocity - Initial Velocity)/Time Taken a = (v - u)/t where v = Final Velocity u = Initial Velocity t = time taken What is Unit of Measurement of Acceleration (We know that formula for velocity is m/s.because we again divide it by s,Measure becomes m/s 2 Example 1A car is moving at a speed of 6 meters/Second In 5 Seconds, he increases its speed to 16 meters /second What is Acceleration Initial Velocity = u = 6 Final Velocity = v = 16 Time Taken = t = 5 a = (Final Velocity - Old Velocity)/Time Taken a = (v - u)/t a = (16 - 6)/5 a = (10)/5 a = 2 Meters/Second 2 Example 2A car Is stationary In 5 Seconds,it reaches its speed to 16 meters /second What is Acceleration Because,Car is Stationary,Its initial velocity = 0 So u = 0 V = 16 Acceleration = Increase in Velocity/Time Taken a = (Final Velocity - Old Velocity)/Time Taken a = (v - u)/t a = (16 - 0)/5 a = (16)/5 a = 3.2 Meters/Second 2 Negative AccelerationSometimes,acceleration of a body decreases Example Speed of car decreases This is called negative acceleration or Retardation Example 3A car is running at a speed of 30 meters/second It applies brake and reaches speed of 22 meters per second in 2 Seconds What is acceleration Final Velocity = v = 22 Time Taken = t = 2 a = (Final Velocity - Old Velocity)/Time Taken a = (v - u)/t a = (22 - 30)/2 a = -8/2 a = -4 Meters/Second 2 So in this case,there is Acceleration of -4 Meters/Second 2 We can say that there is Negative Acceleration of 4 Meters/Second 2
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