Using the data obtained from the timer determine the acceleration due to gravity using the equation of motion Determine the error in the acceleration and quote your result to the appropriate degree of accuracy. How does this compare to the known value of g? What are the main sources of error in this technique? How would the length of the strip affect the accuracy? When the photographs are developed, determine the velocity of the ball bearing in each time interval from their displacements using v = s / t Plot velocity against time on graph paper and from the graph determine the acceleration using a = v / t How does this value compare with the previous value you determined ? What are the biggest sources of error using this technique? How could they be reduced?