# Newton's second law - infinite velocity?

Given the equation $$F_{\text{net}} = ma$$

Does this not imply that if the net force on a certain object is positive, its acceleration will also be positive, and theoretically this object would accelerate forever to an infinite velocity?

i.e envision a block on a surface. If a person were to apply a force (push) on this block that exceeds friction, ad continuously applies this force, this block should technically accelerate infinitely?

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Yes it does, but the law breaks down for large velocities approaching the speed of light. –  David H Dec 1 '13 at 8:46
thanks for your question, BTW you can typeset math nicely by enclosing your equation in dollar signs. –  innisfree Dec 1 '13 at 10:27

$F_\mathrm{net} = p$ still holds. –  lionelbrits Dec 1 '13 at 11:44