XXAMPLE \( 12.11 \) A sack slides off the ramp, shown in Fig. 12-21, with a horizontal ielocity of \( 12 \mathrm{~m} / \mathrm{s} \). If the height of the ramp is \( 6 \mathrm{~m} \) from the floor, jetermine the time needed for the sack to strike the floor and the
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