5) A girl pushes a 150Kg couch across the room. The girl's arms are angled up at 20° above the horizontal as she pushes with a force of 300N. The coefficient of kinetic friction between the
couch and the ground is.15. What is the net force on the couch? What is the magnitude of acceleration?

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.

2.77 x 10^-3 its for plato user 

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