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Part D: The dart is now shot into a block of wood that is in a fixed place. The block exerts a Force F on the dart that is proportional to the dart's Velocity V and in the opposite direction, that is F=-bv, where b is a constant. Derive and expression for the distance L that the dart penetrates into the block, in terms of m (mass), v (initial), and b.

Since the Force -bv is not constant, i can't figure out how to use the kinetic energy 1/2mv^2 to solve for distance, i would think you would need X=Xknot+vknotT+1/2aT^2.