Drops of Water Climbing Stairs

Two equal drops of water are falling through air with a steady velocity v. If the drops coalesced, what will be the new velocity?

64 drops of water are combined to form one big drop. Surface energy of big drop is how many times of any small drop.

A drop of water is broken into two droplets . The sum of which property of the two drops is equal to that of the single one ?

Which joints do we use while climbing the stairs?

Volume of water is a burette is 35 ml. Find the volume of a drop of water if volume of water in the burette is 5 ml when 50 drops of water drained out