Question

A metal ball cools from 62ºC to 50ºC in 10min and to 42ºC the next to minutes. What will be its temperature at the end of next ten minutes ?

(1) 3.67ºC 

(2) 36.7ºC

(3) .376ºC 

(4) 367ºC

Answer 1

Correct Answer is: (2) 36.7ºC

to get the following equations

Divide 2 by 1 and Solve to get θ₀

Let after the next 10 min the temperature falls to then

From (3) using value of θ₀ = 26 we get