At first, the system is statics. Then, a spring with spring constant k is pressed with Δx = A. At t=0, mass m and M are released so mass m and M have relative velocity to the Earth (vm and vM)
Determine both velocity in k, A, m, M
E = E'
p = p'
The Attempt at a Solution
Actually, I've got the solution in my book.
The solution is to use the conservation of energy and momentum.
But, what I don't understand is why using conservation of momentum ?
I think the momentum is not conserved, since there is force of the spring that makes both vm and vM goes in the same direction.
I imagine it. First, the system is static (initial momentum is zero). Then, the object m and M is moving in the same direction (so, I think that the final momentum is not zero)
Please help me understand the concept of conservation of momentum
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