help me to answer this question step by step...the final ans can be seen below of the question

Question 6 A 25-cm-diameter stainless steel ball (p=8055 kg/m3, Cp=480 J/kg.K) is removed from the oven at a uniform temperature of 300 C. The ball is then subjected to the flow of air at 1 atm pressure and 25C with a velocity of 3 m/s. The surface temperature of the ball eventually drops to 200 C. (a) Determine the average convection heat transfer coefficient during this cooling process (b) Estimate how long the process will take. (C) State all the assumptions you applied in solving this problem. Air T. = 25C V = 3 m/s Steel ball 300C Hint: The surface temperature of the ball during cooling is changing. Therefore, the convective heat transfer coefficient between the ball and the air will also change (can you explain, why?). To avoid this complexity, we need to assume the surface temperature of the ball to be constant at a temperature. What is the suitable surface temperature to be used? Ans: (a) 13.8 W/m2.K; (b) 1hr26mins