A certain freezing process requires that room temperature be lowered from 40 degree Celsius at rate of 5 degree Celsius every hour what will be the room temperature 10 hours after the process begins?

Given that

Let us assume that the lowered temperature as negative,

Initial temperature = 40oC

Change in temperature per hour = -5oC

Change in temperature after 10 hours = (-5) × 10 = -50oC

∴The final room temperature after 10 hours of freezing process = 40oC + (-50oC)

= -10oC

The room temperature 10 hours after the process begins= -10oC

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