The velocity of electron in second shell of hydrogen atom is:

According to Bohr, velocity of an electron (v)
$=2.188\times {10}^6\frac{\mathrm{Z}}{\mathrm{n}}\mathrm{m}/\sec$
for H;  Z  =  1  n = 2 (given)
$\therefore \mathrm{V}=\frac{2.188\times {10}^6\times 1}{2}=1.094\times {10}^6\mathrm{m}/\sec$