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Homework Statement
A spring loaded gun fires a 0.56g ball at an angle of 45 degrees from a horizontal lab bench at a height of 1.30m. The ball strikes the floor 5.64m horizontally (range) from the point of release. If the spring is compressed by 6.50 cm, what is the gun's spring constant
Homework Equations
1/2kx^2
1/2mv^2
The Attempt at a Solution
The final step is to sub the values for 1/2mv^2 = 1/2kx^2 and find the value for k.
Here's my diagram
http://img210.imageshack.us/img210/9712/diagramu.jpg
Cos 45 = Vx/V1
Vx = cos 45(v1)
Vx = Dx/t
(cos45)(v1) = dx/t
v1 = dx/(cos 45)t
From here I need to solve for time, but i have no idea how to
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