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Chapter 9: Q.7 (page 227)
A 20 g particle is moving to the left at 30 m/s. A force on the particle causes it to move the the right at 30 m/s. How much work is done by the force?
Net work done is Zero
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a. What is the spring constant?
b. How long is the spring when a 3.0 kg mass is suspended from it?
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