According to Newton’s law of cooling “The change of temperature of a body is proportional to the difference between the temperature of a body and that of the surrounding medium”. If t1℃ is the initial temperature of the body and t2℃ is the constant temperature of the medium, T℃ be the temperature of the body at any time t then find the expression for T℃ as a function of t1℃, t2℃ and time t.

• A. T=t1+(t2) e-kt
• B. T=t2+(t1-t2) e-kt
• C. T=t1+(t1-t2) ekt
• D. T=t2+(t1) ekt