A 10 m aluminum flagpole is installed at $30 ° C$ .After 2 days , the temperature drops to - $10 ° C$ How much does the height change of the flagpole (in mm)?

(Assume thermal expansion coefficient for aluminm

- 1
  
  7.8 mm
- 2
  
  8.8 mm
- 3
  
  9.5 mm
- 4
  
  9.2 mm

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