The following data were obtained when a small steel ball was released from rest from various measured heights:
Height s (m): 2.0, 4.0, 6.0, 8.0, 10.0
Measured time t (s): 0.64, 0.90, 1.11, 1.28, 1.43
(i) Complete a table in your answer book showing t2 for each observation.
(ii) On graph paper, plot height s on the vertical axis against t2 on the horizontal axis and draw the best-fit straight line.
(iii) From the slope of the straight line, determine a value for the acceleration due to gravity.
(iv) State any two experimental factors that could cause the value obtained in part (iii) to differ from the accepted value.