To increase the acceleration of the dog sled, the best option would be to remove a dog from the sled. This would decrease the total mass being pulled, allowing for a greater acceleration according to Newton's second law of motion (F=ma), where acceleration (a) is inversely proportional to mass (m) when the force (F) is constant.
Adding more mass to the sled or running it up a hill would both decrease acceleration, and adding another dog would increase the total mass, leading to decreased acceleration as well.
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