To keep her dog from running away while she talks to a friend, Susan pulls gently on the dog's leash with a constant force given by F = (2.1 N ) ^x+ (1.5 N )^y a.) How much work does she do on the dog if its displacement is d= (0.35m )^x b.) How much work does she do on the dog if its displacement is d = (0.33 m )^y ,or c,) How much work does she do on the dog if its displacement is d = (-0.60 m)^x + (-0.37 m)^y