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**2-body problems--Need help calculating!**

A 20 kg block (A) rests on a frictionless table; a cord attached to the block extends horizontally to a pulley at the edge of the table. A 10 kg mass (B) hangs at the end of the cord.

a) Clearly draw and label the force vectors acting on each object.

b) Calculate the acceleration of the block and mass.

c) Calculate the tension in the cord.

I do not understand how to calculate the Net force. I do know that I need the Net force to get the acceleration of the block and mass, because F

_{Net}= m * a.

Also, I need help on calculating the tension in the cord as well. I don't know which numbers to use or how to get numbers for the equation if they aren't a given...

Thanks so much!

-Genevieve