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March 27, 2017

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A 23 g bullet traveling 220 m/s penetrates a 4.2 kg block of wood and emerges cleanly at 140 m/s.

If the block is stationary on a frictionless surface when hit, how fast does it move after the bullet emerges?

  • Physics - ,

    conservation of momentum:

    M*0+23*220=M*Vf+23*140
    M = 4200 grams solve for Vf

  • Physics - ,

    230

  • Physics - ,

    140 m/s

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