What is the dimensional formulae of "Mass per unit Area"?

Answer&Explanation:

Since dimensional formula is the way of expressing physical quantity in terms of it's dimension;

Mass per unit area will be,,

Mass=M

Area=L×L=L²

Therefore dimensional formula is=ML^-2 and not M/L²

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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.