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Homework Statement
A toy rifle shoots a spring of mass 0.008kg and with a spring constant of 350 N/m. You wish to hit a target horizontally a distance of 15m away by pointing the rifle 45o above the horizontal. How far should you extend the spring in order to reach the target?
Homework Equations
E = 1/2(k)(x)2
F = kx
KE = 1/2(m)(v)2
Any relevant kinematics formulae.
The Attempt at a Solution
Normally for questions like this I would equate potential spring energy to the kinetic energy, but here I am missing a velocity as well as the spring compression length so I am a little lost.