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A spring has an unstretched length of 12cm. When an 80 g ball is hung from it, the length increases by 4.0 cm. Then the ball is pulled down another 4.0 cm and released.
a) What is the spring constant?
b) What is the period of the oscillation?
Reply in m/s. Also, why does the car's mass not matter.
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Find the total work done on the car
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