A metal bar with initial temperature of 20C is dropped into a container of boiling water. do Newton's law of cooling/heating is given by =k(0-0) where (t) is the temperature at time dt t, 0, is the ambient temperature and constant & is the material property. Find the temperature of the bar as a fauction of time. Given that after 1 second the temperature of the bar reached 90C, find the constant k (iii) How long will it take for the bar to reach 98C? Ans: 0(t) = 100-80e ; 1.77 s -2.08 =