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Posted by 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 - , 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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