- #1
RandomGuy1
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Homework Statement
A block of mass m is suspended through a spring of spring constant k[I/] and is in equilibrium. A sharp blow gives the block an initial downward velocity v. How far below the equilibrum position does the block come to an instantaneous rest?
Homework Equations
Potential energy of a compressed or extended spring: 1/2 kx2
Gravitational Potential energy: mgh
The Attempt at a Solution
When the block is at equilibrium, kx = mg.
This implies x = mg/k
Potential energy of the spring in this position = 1/2 kx2 = (mg)2/2k
Taking the gravitational potential energy to be zero in this position,
total mechanical energy = 1/2 mv2 + (mg)2/2k.
I can't figure out where to go from there.