Let's look at the surface tension of the liquid metal mercury. Mercury has an unusually high surface tension, about 465 dyn/cm. Calculate the excess pressure inside a drop of mercury 4.00 mm in diameter. would the diameter of the drop be if the inside pressure were 5 atm?

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.