Answer:
It take the bullet 0.64 seconds to hit the ground.
Explanation;
We have equation of motion ,
, s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
Here we need to consider only vertical motion of bullet.
Initial velocity = 0 m/s, Displacement = 1.98 m, acceleration = acceleration due to gravity =
, we need to find time taken
Substituting

It take the bullet 0.64 seconds to hit the ground.