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You push a 100 kg couch with a force of 1000 N over a carpet that...

You push a 100 kg couch with a force of 1000 N over a carpet that provides a frictional resistance. What is the net force if the acceleration of the couch is 4 m/s^2?

a) 1000 N

b) 600 N

c) 400 N

d) 250 N

e) not enough info

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