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EXAMPLE: BLOCK AND TACKLE
Examine the system:

Assume the pulley has negligible mass and friction. If the system shown is released from rest,
- Draw the free-body diagram for the system and label all forces.
- How long does it take the block to drop 2 feet?
- What are the speeds of both blocks when the 5 lb block has dropped 2 feet?
- If a spring were added to left of the 10 lb block, what would the spring constant have to be to bring the system to rest when the 5 lb block has dropped 2 feet?

Solution
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Free-body diagram without spring.