A particle of specific charge \( \frac{q}{m} \) is projected from the origin towards the positive x-axis with the velocity \( 10 \, \text{m/s} \) in a uniform magnetic field \( B = -2 \hat{k} \, \text{T} \). The velocity \( v \) of the particle after time \( t = 5 \, \text{ms} \) will be (in m/s)