Which is a dopant for a semiconductor that conducts electricity due to the movement of positive charges?a) thallium b) arsenic
c) phosphorus
d) antimony

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

i think the answer would be reserve.