A contestant in a winter sporting event pushes a 38.8-kg block of ice across a frozen lake as shown in part (a) of the figure. Assume that the coefficients of friction for ice on ice are (exactly) \mu_s = 0.1 and \mu_k = 0.03. (a) Calculate the minimum magnitude of the force vector F he must exert to get the block moving. (in Newtons) (b) What is the magnitude of its acceleration once it starts to move, if that force is maintained? in m/s^2 Suppose the contestant now pulls the block as shown in part (b) of the figure. (c) Calculate the minimum magnitude of the force vector F' he must exert to get the block moving. (in Newtons) (d) What is the magnitude of its acceleration once it starts to move, if that force is maintained? (in m/s^2)

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