I rode my bicycle to grandmother's house at 6km/h in a flat road for 5 minute before reach a hill. i went
2km/h up the hill for 3 minute i met a friend and stooped to talk for 5 minute. i went on at 2km/h to my grandmother's house. drow (plot ) the v Against t graph for this motion.

2) a cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. which one of the following graphs best describes the buoyant force b on this block as a function of time t if the block just enters the water at time t = 0 s?