A 8.60x10^3 kg bullet is fired horizontally into a 2.50 kg wooden block attached

Question

A 8.60x10^3 kg bullet is fired horizontally into a 2.50 kg wooden block attached to one end of a massless, horizontal spring (k = 846 N/m). The other end of the spring is fixed in place, and the spring is unstrained initially. The block rests on a horizontal, frictionless surface. The bullet strikes the block perpendicularly and quickly comes to a halt with in it. As a result of this completely inelastic collision, the spring is compressed along its axis and causes the block/bullet to oscillate with an amplitude of 0.200 m. What is the speed of the bullet

Explanation / Answer

0.5mv^2=0.5kx^2

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