Posted by **Robert** on Thursday, November 18, 2010 at 10:18pm.

In Fig. 6-25, blocks A and B have weights of 49 N and 21 N, respectively.

(a) Determine the minimum weight of block C to keep A from sliding, if µs between A and the table is 0.20.

(b) Block C suddenly is lifted off A. What is the acceleration of block A, if µk between A and the table is 0.15?

I'm not really sure where to even start. I've summed my forces, I just don't know how I go about finding the Block C's mass.

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