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## Homework Statement

What is the mass of the block?

Given: friction less surface, velocity at each marked point, distance between points 1 and 2, spring constant l = 7 N/m

## Homework Equations

F=ma

Kinematic equations

## The Attempt at a Solution

I tried to solve for a in m = F/a in order to find the mass. My units don't seem to agree, which suggests I have done something wrong.