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can anyone help me with this?

a tree house has a vertical "fire pole" of smooth metal, designed for quick exits. a child of mass 35.7 kg slides down the pole with constant acceleration, starting from rest. the pole is 3.10 m high. the trip to the ground takes 2.00 s. what is the magnitude of the upward force of friction exerted by the pole on the child?

please help im really confuzzeled