Read the vitamin d experiment. what variables would you need to control in order to make the experiment reliable?

are their multiple choices ?

explanation:

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

area of focus

where’s the list ? the question is incomplete