Problem a girl of mass m 54 kg is pulling a sled up a, Ask an Expert

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Problem: A girl of mass m = 54 kg is pulling a sled up a slippery slope. The coefficient of friction between the boots of the girl and the slope is u_s = 0.157 kg. the friction between the sled and the slope is negligible. The girl can pull the sled up the slope with a less than or equal to a_max = 0.030 m/s2 before she begins to slip. Assume the rope connecting the rope to the sled is kept parallel. The angle of the slope is 7 degrees.

Part A: If the sled is being pulled up the slope with a=a_max, what is the mass of the sled?

I need help to determine what the mass of the sled.

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