(13%) Problem 4: A participant in a winter sporting meet pulls a 4/ kg brick of ice in the positive horizontal direction with a cord over his shoulders over' a frozen lake as shown in the figure. Assume the coefficients of static and kinetic friction are #=0.1 and #*=0.03. F 250 & 50% Part (a) Calculate the minimum force F he must exert to get the brick sliding in newtons. Grade Summary Fmin = Deductions 0% Potential 100% sing cost tank 7 9 HOME Submissions cotan( asing acos( F Attempts remaining: 5 atan() acotan() sinh( 3 (0 % per attempt) detailed view cosh( tanh() cotanho END O Degrees O Radians VO BACKSPACE CLEAR Submit Hint Feedback I give up! Hints: 0% deduction per hint. Hints remaining: 4 Feedback: 0% deduction per feedback. & 50% Part (b) What is its acceleration in m/s once it starts to move, if that force is maintained