Asked by Shane
                An aircraft dropped a box of emergency supplies to a group of trampers. The height of the box above the ground, h,  at time, t, is given by the formula: h = 520 - 5t^2 , where h is in metres and t is in seconds. Find how long it takes for the box to fall to the ground.
            
            
        Answers
                    Answered by
            Steve
            
    just solve for t in
520-5t^2 = 0
    
520-5t^2 = 0
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