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Net force questions

1. Homework Statement
A student drags an object across a laboratory table at constant velocity using an applied force of 12 Newtons. Calculate the frictional force

2. a horizontal force of 15 Newtons pulls a 5 kg block along a horizontal surface. If the force produces an acceleration of 2 m/s(squared), what is the frictional force acting on the block?


(add FBD)
 
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You need to show some of your own work, an attempt at the solution, before anyone will help you.
 

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