A contestant in a winter games event pushes a 54.0 kg block of ice across a frozen lake as shown in the figure below. 250 The coefficient of static friction is 0.1 and the coefficient of kinetic friction is 0.03. (For each answer, enter a number.) (a) Calculate the minimum force F (in N) he must exert to get the block moving. N (b) What is its acceleration (in m/s ) once it starts to move, if that force is maintained? m/s2