Question

A hanging mass m = 1kg on a l = 1 m long rod is raised at an angle θ and let go.
It collides heads on and elastically with a 2-kg mass that is attached to a
horizontal spring with k = 200 N/m. After collision the spring is compressed by Δx
= 30 cm. Derive an expression for θ as a function of m, k, l, g, and Δx. Make sure
that dimensions are correct. Find the angle.

Answer 1

Will need Conservation of momentum

Answer 2

Is there a picture that accompanies this?

Answer 3

no
:(

Answer 4

oh wait hold on

Answer 5

let me post it

Answer 6

OK here's the pciture help pls

Answer 7

height = l - l cos {theta}