No, the answer would not be 30, it would not be multiplied. In this equation, each dog is independent of the others. If each dog pushes the sled at 6 Newtons, you would merely add the forces together. (Five dogs, 6 Newtons each is 5+6=11) In this case, it would be 11 Newtons. The link below should help explain it a bit. Because all dogs are moving in the same direction, they complement each other. If any of the dogs were moving in the other direction, you would have to cancel out and subract.
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