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A wooden block sits on a level lab table

Question:

A wooden block sits on a level lab table. A string draped over a pulley connects to a bucket that can be filled with lead pellets. Maggie wants to measure how much applied mass (pettets + bucket) is needed to move the block along the table at a constant speed.
a.) If the applied mass of the bucket and the lead pettes is 0.255 kg and the block has a weight of 12 N, what is the value of u (muw)?
b.) If some extra pellets are added, describe the behavior of the block?

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