physics

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homework question I have and I don't really understand how to do the problem.
Gooluk, the Inuit, is pulling a 62kg sled through the snow on his way home from ice fishing. On the back of the sled is his 50kg sack of fishing tackle. The coefficient of sliding friction between the sled and the snow is .07 and the coefficient of sliding friction between the sled and the sack is 0.100. While pulling, the fishing rod sticking out of his sack catches on a tree branch, but Gooluk doesn't notice and keeps walking. What force does Gooluk need to exert to keep the sled moving with a constant speed while the sack pulled back across it?

  • physics -

    The sled has two friction forces acting on it while the sack is slipping backward.

    Compute the two forces from the weights and friction coefficients given, and add them.

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