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Note that reversing direction means the VELOCITY changes sign from positive to negative, NOT acceleration! I've plotted a graph, where you can see the velocity becomes negative when t=12, not t=8 which is simply a local maxima.http://maxpapers.com/wp-content/uploads/2012/11/9709_s12_qp_41.pdf
please explain q4 part 2,i dont get why limit is taken as 0 to 12 why not 0 to 8 as found in first part..???