Question 2 (a) A balloon's volume V (in cm]) is given by V= s' +2s + 3 where s is the ambient temperature in "C. The ambient temperature s at time t minutes is given by S= (t-3) Write the volume of the balloon as a function of time t and find the volume at time t = 2 minutes. (Marks: 15) (b) The time rate of change of electric current in a circuit is given by di -= 0.4t - 0.6t2 Find the expression for the current as a function of time if i=3 A when /=0 s. (Marks: 15)