The SI unit for energy is the - a) Watt (W)
b) second(s)
c) Joule (J)
d) kilogram (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

the bal will not change its velocity.

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