A metal ball of diameter 60 mm is initially at 220 c. The ball is suddenly cooled by an air jet of 20 c. The heat transfer coefficient is 400 w/m2k. The specific heat, thermal conductivity and density of the metal ball are 400j/kgk,400w/mk and 9000kg/m3, respectively. The ball temperature (in c) after 90 seconds will be approximately
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approximately 3 km and speed is more than at 20km
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