A 0.0125 kg bullet strikes a 0.300 kg block attached to a fixed horizontal spring whose spring constant is 2.25 * 10^3 N/m and sets it into vibration with an amplitude of 12.4 cm. What was the speed of the bullet if the two objects move together after impact?(adsbygoogle = window.adsbygoogle || []).push({});

E = .5 k A^{2}= .5 m v^{2}

Do I use m = mass of bullet + mass of block, or just the mass of the bullet?

Using the former, I get v = 10.5 m/s. Is this right? It just seems kind of slow for a bullet...

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# Homework Help: SHO energy problem

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