In the x-y-plane, the region y>0 has a uniform magnetic field B1^k and the region y<0 has another uniform magnetic field B2^k. A positively charged particle is projected from the origin along the positive y-axis with speed Vo=π m/s at t=0, as shown in the figure. Neglect gravity in this problem. Let t=T be the time when the particle crosses the x-axis from below for the first time. If B2=4B1, the average speed of the particle, in m/s, along the x-axis in the time interval T is _______

In the x-y-plane, the region y>0 has a uniform magnetic field B1^k and the region y<0 has another uniform magnetic field B2^k. A positively charged particle is projected from the origin along the positive y-axis with speed Vo=π m/s at t=0, as shown in the figure. Neglect gravity in this problem. Let t=T be the time when the particle crosses the x-axis from below for the first time. If B2=4B1, the average speed of the particle, in m/s, along the x-axis in the time interval T is ________.

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