If a 4 ohms resister, a 7 ohms resistor and a 12 ohms resistor are connected in a parallel, which resistor has the most current in it?

Each resistor has the same voltage across it, and Current=(voltage)/(resistance).

The lowest resistance has the highest current through it.  That's the 4-ohm unit.

explanation:

newton's third law, for every action there is an equal and opposite reaction.

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