HELP ME SOLVE THIS QUESTION PLEASE.

newton's first law of motion

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

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.