A conducting rod with length 0.153 m, mass 0.150 kg, and resistance 78.9 Ω moves without friction on metal rails as shown in the following figure. A uniform magnetic field with magnitude 1.50 T is directed into the plane of the figure. The rod is initially at rest, and then a constant force with magnitude 1.90 N and directed to the right is applied to the bar. Part A How many seconds after the force is applied does the bar reach a speed of 25.9 m/s? Express your answer with the appropriate units. t =