In scientific notation, 474,000 is written:

4.74 x (103)
4.74 x (104)
4.74 x (105)
4.74 x (106)

The answer is 4.74 × 10⁵

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be