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a bullet of mass m=5g is fired into a wooden block with mass M= 0.995 kg...

a bullet of mass m=5g is fired into a wooden block with mass M= 0.995 kg which then compresses a spring (k=100N/m by a distance of x=0.1 before coming to rest. the bullet remains embedded in the wooden block. ignore friction between the block and table. a) what is initial speed of the bullet? b) calculate total kinetic energy of the bullet block-system immediately before and after the collision. is the collision between the bullet and the block elastic or inelastic.

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