Select the correct answer from the drop-down menu. This rock is made from sand and pebbles joined together. The rock formed in a riverbed. It is an example of
rock.

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

so easy. just google the electromagnetic waves and it’ll pop up.