Net Force with Friction · PhysicsBowl 2014 #12

Physics · mechanics

Problem

A box of mass 5.05.0 kgkg is being pushed to the right across a horizontal surface while a constant frictional force of 8.08.0 NN acts on the box. At some instant of time, the box has a speed of 4.04.0 ms\frac{m}{s} and an acceleration of 3.03.0 ms2\frac{m}{s^2}. What is the magnitude of the net force acting on the box at this instant? (A) 7.07.0 NN (B) 12.012.0 NN (C) 15.015.0 NN (D) 20.020.0 NN (E) 23.023.0 NN

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