At time t=0 a positively charged particle of mass m=1.87 g and charge q=7.32 uC is injected into the region of the uniform magnetic B=B k and electric E=−E k fields with the initial velocity v=v0 i. The magnitudes of the fields: B=0.205 T, E=470 V/m, and the initial speed v0=2.34 m/s are given. Find at what time t, the particle's speed would become equal to v(t)=2.22·v0: t= s.