Spring Launcher Equation

Riman643

Homework Statement
What is the generalized equation of the initial launch speed for a spring launcher at different angles? Use PE of the spring, mass, and angle in the equation.
Homework Equations
Ei = Ef
PEspring = 1/2 kx^2
KE = 1/2 mv^2
I am really stuck and confused. I just need the equation. Thanks!

Here is my attempt at solving:

PEspring = 1/2m(Vx^2 +Vy^2)

Last edited:
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Chestermiller

Mentor
Problem Statement: What is the generalized equation of the initial launch speed for a spring launcher at different angles? Use PE of the spring, mass, and angle in the equation.
Relevant Equations: Ei = Ef
PEspring = 1/2 kx^2
KE = 1/2 mv^2

I am really stuck and confused. I just need the equation. Thanks!
What have is your assessment so far?

Riman643

This is my attempt

PEspring = 1/2m(Vx^2 +Vy^2). I know this is not right. I am confused and have been trying to figure this out for two days now. I do not know how to incorporate the angle of the launcher.

Riman643

So here is my next attempt

PEspring = Wgrav + KE
(1/2)kx^2 = mgsin(theta)x + (1/2)mv^2

Is this correct?

Last edited:

haruspex

Homework Helper
Gold Member
2018 Award
So here is my next attempt

PEspring = Wgrav + KE
(1/2)kx^2 = mgsin(theta)x + (1/2)mv^2

Is this correct?
Looks right.

"Spring Launcher Equation"

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