Ateam of eight dogs pulls a sled with waxed wood runners on wet snow ( the dogs have average masses of 19.0 kg, and the loaded sled with its rider has a mass of 210 kg. (a) calculate the acceleration of the dogs starting from rest if each dog exerts an average force of 185 n backward on the snow. (b) calculate the force in the coupling between the dogs and the sled.

(a) The total mass of the dogs is:

The mass of the sled is:

So, the total mass is:

The total force exerted by the dogs is:

So, we can find the acceleration of the dogs by using Newton's second law:

(b) The acceleration we found at point (a) is also the acceleration of the sled, which has a mass of 210 kg. Therefore, the force exerted by the dogs on the sled is equal to the product between the mass of the sled and its acceleration:

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