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## Homework Statement

The stopping distance of a 0.40 kg weight which slides into a spring with k = 750 N/m at a speed of 1/2 m/s is 0.012 metres. Can we now calculate the original uncompressed length of the spring from this info?

## The Attempt at a Solution

m = 0.4kg

k = 750N/m

v = 0.5m/s

x_final = -0.012m

x_initial = ?

My main concern is this

Should I assume the initial spring position is x_initial = 0? Can you pull the spring and stretch it like the picture?

[PLAIN]http://img200.imageshack.us/img200/1659/unledjp.jpg [Broken]

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