Question: please teach me how to solve this A 2 0 0 - lb man uses a pulley system to lift a heavy block. The coefficient

please teach me how to solve this
A 200-lb man uses a pulley system to lift a heavy block. The coefficient of static friction
between his feet and the ground is mu=0.6.
(a) Determine the friction force at the man's feet when the weight of the block is 250 lb.
(b) Determine the maximum weight W the man can lift.
(c) Determine the maximum weight W the man can lift with a pulley added at A.
please teach me how to solve this A 2 0 0 - lb

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