Q. Two particles are fixed to an x axis: particle 1 of charge q1 = +1.1 10-8 C at x = 20 cm and particle 2 of charge q2 = -4.50q1 at x = 70 cm. At what coordinate on the axis is the net electric field produced by the particles equal to zero?
Q. A block with mass m = 13.7 kg slides down an inclined plane of slope angle 15.9 ° with a constant velocity. It is then projected up the same plane with an initial speed 4.50 m/s. How far up the incline will the block move before coming to rest?