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    1. A rock is thrown straight up from a bridge at 16m/s and misses the bridge on its way down falling into the water 15m below.
    a) What is the maximum height above the water reached by the rock?
    b)What is the rock's velocity at the instant before it strikes the water?

    2. Car A is driving east at 120 km/h. Car B is driving west at 90 km/h.
    a) What is the relative velocity of car A with respect to car B?
    b) What is the relative velocity of car B with respect to car A?

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