APFIVE Net Work and Constant Kinetic Energy
A student pushes a 20 kg box across a floor with a constant horizontal force of 80 N. If the coefficient of kinetic friction is 0.30, at what speed must the box move so that the force applied does no net work (i.e., the box’s kinetic energy does not increase nor decrease over time)?
A
26.2 m/s
B
0 m/s
C
4.0 m/s
D
13.6 m/s
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