A body is projected vertically up with velocity $\text{98}{\text{ms}}^{-1}$ after 2 s if the acceleration due to gravity earth disappears, the velocity of the body at the end of next 3 s is

$\text{a}=-g=-9.8{\text{m/s}}^2$

$\text{v}=\text{u}+\text{at}$

$=\text{98}-\left(2\right)\left(9.8\right)$

$=98-19.6=78.4\text{m/s}$

At this time, g cases to act, so object travels with uniform velocity$78.4\text{m/s}$  of up to ‘g’ comes into action .

So velocity after 3 seconds=$78.4\text{m/s}$