From Bridge
A stone is dropped into a river from a bridge 49 m above the water. 101 question?
My friend need the answer of this question hope someone could help
A stone is dropped into a river from a bridge 49 m above the water. Another stone is thrown vertically down 1.4 s after the first is dropped. The stones strike the water at the same time. What is the initial speed of the second stone? Give the answer in m/s and give three significant figures.
first we want to know what time it last that first stone is strike the water: x= 1/2 g *t^2
x = 49 m & g=9.8 --->t^2= 10 t = sqrt(10) = 3.162
then we have this equation : for the both of them > 1/2g*t^2 = 1/2g(t-1.4)^2 + V_o * (t -1.4) =49
then the inital speed of 2 stone is 19.19 m/s
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