hachi_roku
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Homework Statement
a .7 lb block rests on top of a .5 lb block supported by but not attached to a spring of constant 9 lb/ft. the upper block is suddenly removed. determine the maximum velocity reached by the .5 lb block.
Homework Equations
The Attempt at a Solution
i have already solved the probelm. my question is, why is the expression for the force on the spring F = 1.2 - kx =>> 1.2 - 9x.
i get the 1.2 part but I am not understanding why its 1.2 minus 9x. I am trying to understand this visually with arrows but its not quite working...pls help!