A hot body is exposed to an environment at a constant temperature of 280K. If after 1 minute the temperature of the body is 350K and after 5 minutes it is 310K. determine an expression for the temperature () and use Excel to sketch the graph of against time for t from 0 to 5 minutes and comment on the shape of your graph. Note: Where T is kelvin temperature of the environment, is the kelvin temperature of the body, t is time in seconds and k is a constant and: (d /dt) = k( - T)