Posted by **Seth** on Sunday, October 2, 2011 at 9:53pm.

A box of books weighing 290 N is shoved across the floor of an apartment by a force of 400 N exerted downward at an angle of 35.0° below the horizontal. If the coefficient of kinetic friction between box and floor is 0.57, how long does it take to move the box 3.80 m, starting from rest?

- Physics -
**drwls**, Sunday, October 2, 2011 at 10:36pm
Calculate the acceleration rate, a, using Newton's second law:

Fnet = M a

Then get the required time t using

3.80 m = (a/2) t^2

The net force Fnet is the difference between 400 N and the friction force.

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