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7. [-/12.5 Points] DETAILS OBINPHYS8 5.P.003. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An iron railroad rail is 800 ft long when the temperature is 360C. What is its length (in ft) when the temperature is -12.C? (Round your answer to at least one decimal place.) ft Need Help? Read It 8. [-/12.5 Points] DETAILS OBINPHYS8 5.P.015. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A 1,240 kg car going 35 m/s is brought to a stop using its brakes. Let's assume that a total of approximately 29 kg of iron in the brakes and wheels absorbs the heat produced by the friction. (a) What was the car's original kinetic energy (in ])? (b) After the car has stopped, what is the change in temperature (in "C) of the brakes and wheels? .C Need Help? Read It