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Simple mechanics

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A toy car with mass 0.020 kg is propelled by a spring with constant 80 N/M onto a track. The track contains a loop of radius 0.10m. Ignore any losses due to friction and use g= 10m/s^2. What is the minimum compression of the spring neccessary for the car to complete the loop without leaving the track?

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Let x be the minimum compression total energy stored in spring = 1/2 k x^2

to ...

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