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skyluke89We are only concerned about the vertical motion of the car, since we want to know how much time it takes to reach the bottom of the cliff, 42.3 meters below. Calling h=42.3 m, the vertical position of the car at time t is given by: where is the gravitational acceleration, and is the initial vertical velocity of the car, which is zero since the car is initially travelling only in the horizontal direction. Therefore, the equation becomes We want to find the time t at which y(t)=0, so we have The car takes 2.9 seconds to reach the ground.