Asked by moooose
                A rock is given a KE of 2.00*10^4 J when it is launched vertically upward. 
If the rock reaches a height of 50m determine the mass of the rock.
            
        If the rock reaches a height of 50m determine the mass of the rock.
Answers
                    Answered by
            Damon
            
    (1/2) m v^2 start  = m g h at top
so
m g h = 2 * 10^4
m = 2*10^4 / (9.81*50)
= 40.8 kg
    
so
m g h = 2 * 10^4
m = 2*10^4 / (9.81*50)
= 40.8 kg
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