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since the graph is distance time graph take the gradient and it will be the speed of the ball..... but the gradient at time t=0.40 otherwise if u take 0.55/0.4 will be he average speed of the ball......http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s10_qp_21.pdf
Q2 (bii), how did we find the speed?!