Example #1: Push-Away With Energy
Practice: Two blocks (3 kg and 4 kg) on a smooth floor are pressed against a light spring (force constant 800 N/m) between them. When the blocks are released, the 3 kg is launched with 10 m/s.
(a) What speed is the 4 kg launched with?
(b) How much was the spring compressed by before the blocks were released?