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Help finding potential energy of spring.

  1. Oct 14, 2007 #1
    Block A has mass 1.00 kg, and block B has mass 3.00 kg. The blocks are forced together, compressing a spring between them; then the system is released from rest on a level, frictionless surface. The spring, which has negligible mass, is not fastened to either block and drops to the surface after it has expanded. Block B acquires a speed of 1.10 m/s.

    a) What is the final speed of block A? Found this answer to be 3.30 m/s

    b) How much potential energy was stored in the compressed spring?
    - how do you find this answer?? KEa+KEb=9.075 ... not right
  2. jcsd
  3. Oct 14, 2007 #2


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    check again your math in the KE calculation.
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