11th grade
posted by Bill .
A box of books weighing 229 N is shoved across the floor by a force of 420 N exerted downward at an angle of 35° below the horizontal.If µk between the box and the floor is 0.75, how long does it take to move the box 7 m, starting from rest? (If the box will not move, enter 0.)

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TAke the downward component of the force, add that to weight, to find the normal force. Then you can calculate friction force.
Compute the horizontal component of the pushing force.
horizontal forcefriction=mass*acceleration
find acceleration.
distance=1/2 a t^2 solve for time.
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