A block of weight Q rests on an inclined plane and it is attached to a string which runs over a frictionless pulley to carry a block of weight P at its other end. The coefficient of friction between the block of weight Q and the inclined plane is u. Consider the following cases: Case I: weight Q starts moving down the inclined plane. Case II: weight P starts falling down. a The limiting values of ratio P/Q for Case I and Case II respectively are (a) (sina - cosa) and (sina + cosa) (b) (usina - cosa) and (usina + cosa) (c) (sina+ucosa) and (sina - ucosa) (d) (usina + cosa) and u(sina - cosa)