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** You shoot a 0.050-kg arrow into a 0.50-kg wooden cart that sits on a horizontal, frictionless surface at the end of a spring that is attached to the wan at the other end. The arrow hits the cart and sticks into it. The cart and arrow together compress the spring and start the system vibrating at a frequency of 2.0 Hz with a 0.20-m amplitude. How fast was me arrow moving? State any assumptions you made to solve the problem.
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