In an experiment two identical rocks are simultaneouslythrown from the edge of a cliff a distance ho above theground. Rock A is thrown vertically upward with speed voand rock B is thrown vertically downward with speed vo -Rock A and rock B strike the ground at times ta and tB,respectively. Consider the positive vertical direction to beupward.(a) On the axes given below, sketch and label graphs ofthe velocity as a function of time for rock A and rock B.1Label the time tB. Times ta and ta are given on thegraph.Velocity아.+ Time2.В IΩIIII

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