A water holding tank measures 95 m long, 40 m wide, and 12 m deep. Traces of mercury
have been found in the tank, with a concentration of 60 mg/L.
What is the total mass of mercury in the
tank?
Answer in units of kg

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

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle