Rate of cooling with unknown starting temp
An object with $T_0 = x$ is in a room with fixed temp 30 celcius. After
ten minutes the objects temp is negative $10$ celsius and after 10 more
minutes it is negative $5$ celsius What was the $T_0$? This is a Newton's
law of cooling problem.
I guess since there is no k given that the cooling rate is constant and it
warms five degrees per 10 minutes to $T_0 = -15$
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